Drop usage of test -e in configure as it is not portable.
Fixes #1439538
Will backport to 2.4
Also regenerate pyconfig.h.in.
diff --git a/configure b/configure
index f7f99eb..ccdf62e 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 47023 .
+# From configure.in Revision: 47267 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.59 for python 2.5.
 #
@@ -22040,38 +22040,55 @@
 
 echo "$as_me:$LINENO: checking for /dev/ptmx" >&5
 echo $ECHO_N "checking for /dev/ptmx... $ECHO_C" >&6
-
-if test -e /dev/ptmx
-then
-  echo "$as_me:$LINENO: result: yes" >&5
-echo "${ECHO_T}yes" >&6
+if test "${ac_cv_file__dev_ptmx+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  test "$cross_compiling" = yes &&
+  { { echo "$as_me:$LINENO: error: cannot check for file existence when cross compiling" >&5
+echo "$as_me: error: cannot check for file existence when cross compiling" >&2;}
+   { (exit 1); exit 1; }; }
+if test -r "/dev/ptmx"; then
+  ac_cv_file__dev_ptmx=yes
+else
+  ac_cv_file__dev_ptmx=no
+fi
+fi
+echo "$as_me:$LINENO: result: $ac_cv_file__dev_ptmx" >&5
+echo "${ECHO_T}$ac_cv_file__dev_ptmx" >&6
+if test $ac_cv_file__dev_ptmx = yes; then
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_DEV_PTMX 1
 _ACEOF
 
-else
-  echo "$as_me:$LINENO: result: no" >&5
-echo "${ECHO_T}no" >&6
 fi
 
 echo "$as_me:$LINENO: checking for /dev/ptc" >&5
 echo $ECHO_N "checking for /dev/ptc... $ECHO_C" >&6
-
-if test -e /dev/ptc
-then
-  echo "$as_me:$LINENO: result: yes" >&5
-echo "${ECHO_T}yes" >&6
+if test "${ac_cv_file__dev_ptc+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  test "$cross_compiling" = yes &&
+  { { echo "$as_me:$LINENO: error: cannot check for file existence when cross compiling" >&5
+echo "$as_me: error: cannot check for file existence when cross compiling" >&2;}
+   { (exit 1); exit 1; }; }
+if test -r "/dev/ptc"; then
+  ac_cv_file__dev_ptc=yes
+else
+  ac_cv_file__dev_ptc=no
+fi
+fi
+echo "$as_me:$LINENO: result: $ac_cv_file__dev_ptc" >&5
+echo "${ECHO_T}$ac_cv_file__dev_ptc" >&6
+if test $ac_cv_file__dev_ptc = yes; then
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_DEV_PTC 1
 _ACEOF
 
-else
-  echo "$as_me:$LINENO: result: no" >&5
-echo "${ECHO_T}no" >&6
 fi
 
+
 echo "$as_me:$LINENO: checking for %zd printf() format support" >&5
 echo $ECHO_N "checking for %zd printf() format support... $ECHO_C" >&6
 if test "$cross_compiling" = yes; then