Workaround for FindMyGUI.cmake path space bug on Windows.

See bug 353 http://bugs.openmw.org/issues/353

cmake/FindMyGUI.cmake

@@ -128,9 +128,11 @@ ELSE (WIN32) #Unix
 ENDIF (WIN32)
 
 #Do some preparation
-SEPARATE_ARGUMENTS(MYGUI_INCLUDE_DIRS)
-SEPARATE_ARGUMENTS(MYGUI_LIBRARIES)
-SEPARATE_ARGUMENTS(MYGUI_PLATFORM_LIBRARIES)
+IF (NOT WIN32) # This does not work on Windows for paths with spaces in them
+	SEPARATE_ARGUMENTS(MYGUI_INCLUDE_DIRS)
+	SEPARATE_ARGUMENTS(MYGUI_LIBRARIES)
+	SEPARATE_ARGUMENTS(MYGUI_PLATFORM_LIBRARIES)
+ENDIF (NOT WIN32)
 
 SET(MYGUI_LIBRARIES ${MYGUI_LIBRARIES} ${FREETYPE_LIBRARIES})