[arch-general] [easytag] Updates and improvements for libmp4v2 version 2.0

This makes easytag compile against the newest version of libmp4v2. I haven't done extensive testing, but I have tried it on a number of files with adding/removing/changing tags and it seems to all work fine. Let me know if further updates/changes would be useful. Regards, Nick - Use new API functions - Actually remove tags when requested instead of setting to empty string - Report errors to log when errors occur in reading tags --- src/mp4_header.c | 6 +- src/mp4_tag.c | 189 +++++++++++++++++++++++++++++++++--------------------- 2 files changed, 119 insertions(+), 76 deletions(-)