Fix PR1606:
The AC_CHECK_HEADER macro was used instead of AC_CHECK_HEADERS. The former does
not automatically add a #define to the configure variables while the latter
does. Consequently, the HAVE_PTHREAD_H symbol was not defined which caused the
Mutex.cpp file to compile to an empty implementation. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41137 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 5ba07c8..b639c88 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -689,10 +689,11 @@
 
 AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
 AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h unistd.h utime.h])
-AC_CHECK_HEADERS([windows.h sys/mman.h sys/param.h sys/resource.h sys/time.h])
+AC_CHECK_HEADERS([windows.h])
+AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h])
 AC_CHECK_HEADERS([sys/types.h malloc/malloc.h mach/mach.h])
 if test "$ENABLE_THREADS" -eq 1 ; then
-  AC_CHECK_HEADER(pthread.h,
+  AC_CHECK_HEADERS(pthread.h,
                   AC_SUBST(HAVE_PTHREAD, 1),
 		   AC_SUBST(HAVE_PTHREAD, 0))
 else