Make sure we link using the right libs by using pkg-config
Originally committed as revision 23511 to svn://svn.ffmpeg.org/ffmpeg/trunk
enabled libopencore_amrnb && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb -lm
enabled libopencore_amrwb && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb -lm
enabled libopenjpeg && require libopenjpeg openjpeg.h opj_version -lopenjpeg
-enabled librtmp && require librtmp librtmp/rtmp.h RTMP_Init -lrtmp
+enabled librtmp && require librtmp librtmp/rtmp.h RTMP_Init $(pkg-config --libs librtmp)
enabled libschroedinger && add_cflags $(pkg-config --cflags schroedinger-1.0) &&
require libschroedinger schroedinger/schro.h schro_init $(pkg-config --libs schroedinger-1.0)
enabled libspeex && require libspeex speex/speex.h speex_decoder_init -lspeex