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

[Nick Lanham]

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(-)