- 0.4.6, updated opt patch

- 0.4.6, updated opt patch
- added imlib2 patch to fix imlib2 detection
- added libtool patch - use libtool to build shared libraries correctly
- standard split + vhook-imlib2 subpackage (because of imlib2 dependency)
- changed config file perms - ffserver shouldn't be run as root

Changed files:
    ffmpeg-imlib2.patch -> 1.1
    ffmpeg-libtool.patch -> 1.1
    ffmpeg-opt.patch -> 1.3
    ffmpeg.spec -> 1.15