Mark AVERROR_ENOENT for deletion at the next libavutil major bump.

The symbol is currently unused, AVERROR(ENOENT) must be used instead.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22519 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/error.h

@@ -36,13 +36,13 @@
 
 #if LIBAVUTIL_VERSION_MAJOR < 51
 #define AVERROR_IO          AVERROR(EIO)     /**< I/O error */
+#define AVERROR_NOENT       AVERROR(ENOENT)  /**< No such file or directory. */
 #define AVERROR_NOMEM       AVERROR(ENOMEM)  /**< not enough memory */
 #define AVERROR_UNKNOWN     AVERROR(EINVAL)  /**< unknown error */
 #endif
 
 #define AVERROR_EOF         AVERROR(EPIPE)   /**< End of file. */
 #define AVERROR_INVALIDDATA AVERROR(EINVAL)  /**< invalid data found */
-#define AVERROR_NOENT       AVERROR(ENOENT)  /**< No such file or directory. */
 #define AVERROR_NOFMT       AVERROR(EILSEQ)  /**< unknown format */
 #define AVERROR_NOTSUPP     AVERROR(ENOSYS)  /**< Operation not supported. */
 #define AVERROR_NUMEXPECTED AVERROR(EDOM)    /**< Number syntax expected in filename. */