FindQuickTime: use find_package_handle_standard_args()

Modules/FindQuickTime.cmake

@@ -41,9 +41,7 @@ ELSE(APPLE)
   )
 ENDIF(APPLE)
 
-SET(QUICKTIME_FOUND "NO")
-IF(QUICKTIME_LIBRARY AND QUICKTIME_INCLUDE_DIR)
-  SET(QUICKTIME_FOUND "YES")
-ENDIF(QUICKTIME_LIBRARY AND QUICKTIME_INCLUDE_DIR)
-
-
+# handle the QUIETLY and REQUIRED arguments and set QUICKTIME_FOUND to TRUE if
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(QuickTime DEFAULT_MSG QUICKTIME_LIBRARY QUICKTIME_INCLUDE_DIR)