cmake maintenance

blender_add_lib now takes a separate include argument to suppress warnings in system includes (mostly ffmpeg & python).
also only build wm_apple.c on apple+carbon configuration.

source/blender/blenpluginapi/CMakeLists.txt

@@ -34,6 +34,10 @@ set(INC
 	../../../intern/guardedalloc
 )
 
+set(INC_SYS
+
+)
+
 set(SRC
 	intern/pluginapi.c
 
@@ -46,8 +50,8 @@ set(SRC
 )
 
 if(WITH_CODEC_QUICKTIME)
-	list(APPEND INC ${QUICKTIME_INC})
+	list(APPEND INC_SYS ${QUICKTIME_INC})
 	add_definitions(-DWITH_QUICKTIME)
 endif()
 
-blender_add_lib(bf_blenpluginapi "${SRC}" "${INC}")
+blender_add_lib(bf_blenpluginapi "${SRC}" "${INC}" "${INC_SYS}")