[Libav-user] make ffmpeg examples compile cleanly under fedora 19

[Torsten Kühnel]

Hi,
i just found some simple errors in getting the ffmpeg-examples compile 
under Fedora 19.

1. there is a missing dependency when installing ffmpeg-devel, i had to 
issue
"yum install libvpx-devel" to solve a missing symbols error during 
linking the examples. This
should go to the rpmfusion repository maintainer i think.

2. in the Makefile a simple line is missing for another example to link 
against libm, so a

resampling_audio: LDLIBS += -lm

did it.
Just what i found out on my way and want to share it. Thanks a lot for 
your work !