adjust FindMyGUI.cmake to correctly handle REQUIRED and QUIETLY

cmake/FindMyGUI.cmake

@@ -146,11 +146,12 @@ IF (MYGUI_FOUND)
     IF (NOT MYGUI_FIND_QUIETLY)
         MESSAGE(STATUS "MyGUI version: ${MYGUI_VERSION}")
     ENDIF (NOT MYGUI_FIND_QUIETLY)
-
-ELSE (MYGUI_FOUND)
-    IF (MYGUI_FIND_REQUIRED)
-        MESSAGE(FATAL_ERROR "Could not find MYGUI")
-    ENDIF (MYGUI_FIND_REQUIRED)
 ENDIF (MYGUI_FOUND)
 
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(MyGUI DEFAULT_MSG
+    MYGUI_INCLUDE_DIRS
+    FREETYPE_LIBRARIES
+    MYGUI_LIBRARIES)
+
 CMAKE_POLICY(POP)