Fix OS X CMake build.

I have ***NO*** idea why this makes a difference, but, without this
change, APPLE_CORE_FOUNDATION_LIBRARY is apparently *not* set correctly
for wsutil/CMakeLists.txt, and, with this change, it is.  I guess
there's something magic involved here with "global" CMake variables or
something crazy such as that.

Change-Id: I7a0046b9c249568cd666720838104f48e854e203
Reviewed-on: https://code.wireshark.org/review/2612
Reviewed-by: Guy Harris <guy@alum.mit.edu>

Makefile.am

@@ -1010,6 +1010,7 @@ EXTRA_DIST = \
 	cmake/modules/FindLUA.cmake		\
 	cmake/modules/FindLYNX.cmake		\
 	cmake/modules/FindM.cmake		\
+	cmake/modules/FindOS_X_FRAMEWORKS.cmake	\
 	cmake/modules/FindPCAP.cmake		\
 	cmake/modules/FindPOD.cmake		\
 	cmake/modules/FindPORTAUDIO.cmake	\

cmake/modules/FindOS_X_FRAMEWORKS.cmake

@@ -0,0 +1,21 @@
+#
+# - Find OS X frameworks
+# Find various OS X frameworks if we're on OS X
+#
+#  APPLE_APPLICATION_SERVICES_LIBRARY - ApplicationServices framework
+#  APPLE_CORE_FOUNDATION_LIBRARY      - CoreFoundation frameowkr
+#  APPLE_SYSTEM_CONFIGURATION_LIBRARY - SystemConfiguration framework
+#  HAVE_OS_X_FRAMEWORKS               - True if we're on OS X
+
+
+if(APPLE)
+	#
+	# We assume that APPLE means OS X so that we have the OS X
+	# frameworks.
+	#
+	set(HAVE_OS_X_FRAMEWORKS 1)
+	set(OS_X_FRAMEWORKS_FOUND TRUE)
+	FIND_LIBRARY (APPLE_APPLICATION_SERVICES_LIBRARY ApplicationServices)
+	FIND_LIBRARY (APPLE_CORE_FOUNDATION_LIBRARY CoreFoundation)
+	FIND_LIBRARY (APPLE_SYSTEM_CONFIGURATION_LIBRARY SystemConfiguration)
+endif()

wsutil/CMakeLists.txt

@@ -93,6 +93,14 @@ set(WSUTIL_FILES
 	${WSUTIL_SSE42_FILES}
 )
 
+if(APPLE)
+	#
+	# We assume that APPLE means OS X so that we have the OS X
+	# frameworks.
+	#
+	FIND_LIBRARY (APPLE_CORE_FOUNDATION_LIBRARY CoreFoundation)
+endif()
+
 set(wsutil_LIBS
 	${APPLE_CORE_FOUNDATION_LIBRARY}
 	${GMODULE2_LIBRARIES}