[packman] Please add opencore amr support

[Carl Eugen Hoyos]

Hi!

Support for libamr was removed today from FFmpeg's repository:
http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2009-July/023560.html

Instead, support for opencore amr was added some time ago (does not support wb
encoding). Please add opencore-amr to Packman, so amr decoding will still be
supported in the future.

(I don't know the "official" repository, but I just tried 
http://sourceforge.net/projects/opencore-amr/ and I had to add "-fPIC" to
CXXFLAGS in amrnb/Makefile and amrwb/Makefile.)

Thank you for your work, Carl Eugen