core-config: Fix header detection and conflict.

- Fixed `sys/stat.h` detection.
- Fixed `HAVE_PTHREAD_H` define to avoid warning with Python includes.
- Added missing quotes for the semaphore include check.

build-support/core-config-template.h

@@ -15,7 +15,7 @@
 #cmakedefine01 HAVE_STDLIB_H
 #cmakedefine01 HAVE_GETENV
 #cmakedefine01 HAVE_SIGNAL_H
-#cmakedefine   HAVE_PTHREAD_H
+#cmakedefine01 HAVE_PTHREAD_H
 #cmakedefine   HAVE_RT
 
 #endif //NS3_CORE_CONFIG_H

build-support/macros-and-definitions.cmake

@@ -1066,12 +1066,12 @@ macro(process_options)
   check_include_file_cxx("stdint.h" "HAVE_STDINT_H")
   check_include_file_cxx("inttypes.h" "HAVE_INTTYPES_H")
   check_include_file_cxx("sys/types.h" "HAVE_SYS_TYPES_H")
-  check_include_file_cxx("stat.h" "HAVE_SYS_STAT_H")
+  check_include_file_cxx("sys/stat.h" "HAVE_SYS_STAT_H")
   check_include_file_cxx("dirent.h" "HAVE_DIRENT_H")
   check_include_file_cxx("stdlib.h" "HAVE_STDLIB_H")
   check_include_file_cxx("signal.h" "HAVE_SIGNAL_H")
   check_include_file_cxx("netpacket/packet.h" "HAVE_PACKETH")
-  check_include_file_cxx(semaphore.h HAVE_SEMAPHORE_H)
+  check_include_file_cxx("semaphore.h" "HAVE_SEMAPHORE_H")
   check_function_exists("getenv" "HAVE_GETENV")
 
   configure_file(