FindAVIFile: use find_package_handle_standard_args()

Modules/FindAVIFile.cmake

@@ -35,16 +35,14 @@ IF (UNIX)
 
 ENDIF (UNIX)
 
-SET (AVIFILE_FOUND "NO")
-
-IF(AVIFILE_INCLUDE_DIR)
-  IF(AVIFILE_AVIPLAY_LIBRARY)
-    SET( AVIFILE_LIBRARIES  ${AVIFILE_AVIPLAY_LIBRARY} )
-    SET( AVIFILE_FOUND "YES" )
-    SET( AVIFILE_DEFINITIONS "")
-
-  ENDIF(AVIFILE_AVIPLAY_LIBRARY)
-ENDIF(AVIFILE_INCLUDE_DIR)
-
+# handle the QUIETLY and REQUIRED arguments and set AVIFILE_FOUND to TRUE if
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(AVIFile DEFAULT_MSG AVIFILE_INCLUDE_DIR AVIFILE_AVIPLAY_LIBRARY)
+
+IF (AVIFILE_FOUND)
+    SET(AVIFILE_LIBRARIES ${AVIFILE_AVIPLAY_LIBRARY})
+    SET(AVIFILE_DEFINITIONS "")
+ENDIF()
 
 MARK_AS_ADVANCED(AVIFILE_INCLUDE_DIR AVIFILE_AVIPLAY_LIBRARY)