Issue #6834: replace the implementation for the 'python' and 'pythonw' executables on OSX.

The previous implementation used execv(2) to run the real interpreter, which means that
you cannot use the arch(1) tool to select the architecture you want to use for a
universal build because that only affects the python/pythonw wrapper and not the actual
interpreter.

The new version uses posix_spawnv with a number of OSX-specific options that ensure that
the real interpreter is started using the same CPU architecture as the wrapper, and that
means that 'arch -ppc python' now actually works.

I've also changed the way that the wrapper looks for the framework: it is now linked to
the framework rather than hardcoding the framework path. This should make it easier to
provide pythonw support in tools like virtualenv.
diff --git a/configure b/configure
index 7ef3db9..1fe5453 100755
--- a/configure
+++ b/configure
@@ -658,6 +658,7 @@
 CONFIG_ARGS
 UNIVERSALSDK
 ARCH_RUN_32BIT
+LIPO_32BIT_FLAGS
 PYTHONFRAMEWORK
 PYTHONFRAMEWORKIDENTIFIER
 PYTHONFRAMEWORKDIR
@@ -1915,6 +1916,7 @@
 
 
 UNIVERSAL_ARCHS="32-bit"
+
 { echo "$as_me:$LINENO: checking for --with-universal-archs" >&5
 echo $ECHO_N "checking for --with-universal-archs... $ECHO_C" >&6; }
 
@@ -1994,14 +1996,8 @@
 		PYTHONFRAMEWORKINSTALLDIR=$PYTHONFRAMEWORKPREFIX/$PYTHONFRAMEWORKDIR
 		FRAMEWORKINSTALLFIRST="frameworkinstallstructure"
 		FRAMEWORKALTINSTALLFIRST="frameworkinstallstructure bininstall maninstall"
-		if test "$UNIVERSAL_ARCHS" = "all"
-		then
-			FRAMEWORKINSTALLLAST="frameworkinstallmaclib frameworkinstallapps4way frameworkinstallunixtools4way"
-			FRAMEWORKALTINSTALLLAST="frameworkinstallmaclib frameworkinstallapps4way frameworkaltinstallunixtools4way"
-		else
-			FRAMEWORKINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkinstallunixtools"
-			FRAMEWORKALTINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkaltinstallunixtools"
-		fi
+		FRAMEWORKINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkinstallunixtools"
+		FRAMEWORKALTINSTALLLAST="frameworkinstallmaclib frameworkinstallapps frameworkaltinstallunixtools"
 
 		if test "x${prefix}" = "xNONE" ; then
 			FRAMEWORKUNIXTOOLSPREFIX="${ac_default_prefix}"
@@ -2041,11 +2037,6 @@
 	fi
 	enable_framework=
 
-	if test "$UNIVERSAL_ARCHS" = "all"
-	then
-		FRAMEWORKINSTALLLAST=update4wayuniversal
-		FRAMEWORKALTINSTALLLAST=update4wayuniversal
-	fi
 
 fi
 
@@ -3866,7 +3857,7 @@
   { echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6; }
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 
 
@@ -4697,22 +4688,27 @@
 	        if test "$UNIVERSAL_ARCHS" = "32-bit" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch ppc -arch i386"
 		   ARCH_RUN_32BIT=""
+		   LIPO_32BIT_FLAGS="-extract ppc7400 -extract i386"
 
 	         elif test "$UNIVERSAL_ARCHS" = "64-bit" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch ppc64 -arch x86_64"
+		   LIPO_32BIT_FLAGS=""
 		   ARCH_RUN_32BIT="true"
 
 	         elif test "$UNIVERSAL_ARCHS" = "all" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch i386 -arch ppc -arch ppc64 -arch x86_64"
+		   LIPO_32BIT_FLAGS="-extract ppc7400 -extract i386"
 		   ARCH_RUN_32BIT="arch -i386 -ppc"
 
 	         elif test "$UNIVERSAL_ARCHS" = "intel" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch i386 -arch x86_64"
+		   LIPO_32BIT_FLAGS="-extract i386"
 		   ARCH_RUN_32BIT="arch -i386"
 
 	         elif test "$UNIVERSAL_ARCHS" = "3-way" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch i386 -arch ppc -arch x86_64"
-		   ARCH_RUN_32BIT="arch -i386 -ppc"
+		   LIPO_32BIT_FLAGS="-extract ppc7400 -extract i386"
+		   ARCH_RUN_32BIT="arch -i386 -ppc7400"
 
 		 else
 	           { { echo "$as_me:$LINENO: error: proper usage is --with-universal-arch=32-bit|64-bit|all|intel|3-way" >&5
@@ -5414,7 +5410,7 @@
 else
   ac_cv_header_stdc=no
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 fi
 
@@ -5435,7 +5431,7 @@
 else
   ac_cv_header_stdc=no
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 fi
 
@@ -6533,7 +6529,7 @@
 
 
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 { echo "$as_me:$LINENO: result: $was_it_defined" >&5
 echo "${ECHO_T}$was_it_defined" >&6; }
@@ -7063,7 +7059,7 @@
 else
   ac_cv_type_uid_t=no
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 fi
 { echo "$as_me:$LINENO: result: $ac_cv_type_uid_t" >&5
@@ -15723,7 +15719,7 @@
 else
   unistd_defines_pthreads=no
 fi
-rm -f conftest*
+rm -f -r conftest*
 
     { echo "$as_me:$LINENO: result: $unistd_defines_pthreads" >&5
 echo "${ECHO_T}$unistd_defines_pthreads" >&6; }
@@ -17337,7 +17333,7 @@
   $EGREP "yes" >/dev/null 2>&1; then
   ipv6type=$i
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		kame)
@@ -17360,7 +17356,7 @@
 				ipv6libdir=/usr/local/v6/lib
 				ipv6trylibc=yes
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		linux-glibc)
@@ -17381,7 +17377,7 @@
   ipv6type=$i;
 				ipv6trylibc=yes
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		linux-inet6)
@@ -17419,7 +17415,7 @@
 				ipv6lib=inet6;
 				ipv6libdir=/usr/local/v6/lib
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		v6d)
@@ -17442,7 +17438,7 @@
 				ipv6libdir=/usr/local/v6/lib;
 				BASECFLAGS="-I/usr/local/v6/include $BASECFLAGS"
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		zeta)
@@ -17464,7 +17460,7 @@
 				ipv6lib=inet6;
 				ipv6libdir=/usr/local/v6/lib
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 			;;
 		esac
@@ -26007,7 +26003,7 @@
 _ACEOF
 
 fi
-rm -f conftest*
+rm -f -r conftest*
 
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -26026,7 +26022,7 @@
 _ACEOF
 
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 fi
 
@@ -26296,7 +26292,7 @@
 _ACEOF
 
 fi
-rm -f conftest*
+rm -f -r conftest*
 
 fi
 
@@ -28235,6 +28231,7 @@
 CONFIG_ARGS!$CONFIG_ARGS$ac_delim
 UNIVERSALSDK!$UNIVERSALSDK$ac_delim
 ARCH_RUN_32BIT!$ARCH_RUN_32BIT$ac_delim
+LIPO_32BIT_FLAGS!$LIPO_32BIT_FLAGS$ac_delim
 PYTHONFRAMEWORK!$PYTHONFRAMEWORK$ac_delim
 PYTHONFRAMEWORKIDENTIFIER!$PYTHONFRAMEWORKIDENTIFIER$ac_delim
 PYTHONFRAMEWORKDIR!$PYTHONFRAMEWORKDIR$ac_delim
@@ -28289,7 +28286,6 @@
 SO!$SO$ac_delim
 LDSHARED!$LDSHARED$ac_delim
 BLDSHARED!$BLDSHARED$ac_delim
-CCSHARED!$CCSHARED$ac_delim
 _ACEOF
 
   if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
@@ -28331,6 +28327,7 @@
 ac_delim='%!_!# '
 for ac_last_try in false false false false false :; do
   cat >conf$$subs.sed <<_ACEOF
+CCSHARED!$CCSHARED$ac_delim
 LINKFORSHARED!$LINKFORSHARED$ac_delim
 CFLAGSFORSHARED!$CFLAGSFORSHARED$ac_delim
 SHLIBS!$SHLIBS$ac_delim
@@ -28357,7 +28354,7 @@
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 24; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 25; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5