Delete avconfig.h on distclean

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21920 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

Makefile

@@ -139,7 +139,7 @@ clean:: testclean
 
 distclean::
 	rm -f $(DISTCLEANSUFFIXES)
-	rm -f version.h config.*
+	rm -f version.h config.* libavutil/avconfig.h
 
 config:
 	$(SRC_PATH)/configure $(value FFMPEG_CONFIGURATION)