configure: remove superflous -lm flags

Originally committed as revision 23781 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -2526,10 +2526,10 @@ enabled libdirac   && add_cflags $(pkg-config --cflags dirac) &&
                       require  libdirac libdirac_encoder/dirac_encoder.h dirac_encoder_init $(pkg-config --libs dirac)
 enabled libfaac    && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
 enabled libgsm     && require  libgsm gsm/gsm.h gsm_create -lgsm
-enabled libmp3lame && require  libmp3lame lame/lame.h lame_init -lmp3lame -lm
+enabled libmp3lame && require  libmp3lame lame/lame.h lame_init -lmp3lame
 enabled libnut     && require  libnut libnut.h nut_demuxer_init -lnut
-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 libopencore_amrnb  && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb
+enabled libopencore_amrwb  && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb
 enabled libopenjpeg && require libopenjpeg openjpeg.h opj_version -lopenjpeg
 enabled librtmp    && require  librtmp librtmp/rtmp.h RTMP_Init $(pkg-config --libs librtmp)
 enabled libschroedinger && add_cflags $(pkg-config --cflags schroedinger-1.0) &&
@@ -2539,7 +2539,7 @@ enabled libtheora  && require  libtheora theora/theoraenc.h th_info_init -ltheor
 enabled libvorbis  && require  libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
 enabled libvpx     && require2 libvpx "vpx/vpx_decoder.h vpx/vp8dx.h" "vpx_codec_dec_init_ver" -lvpx &&
                       require2 libvpx "vpx/vpx_encoder.h vpx/vp8cx.h" "vpx_codec_enc_init_ver" -lvpx
-enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 -lm &&
+enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 &&
                       { check_cpp_condition x264.h "X264_BUILD >= 98" ||
                         die "ERROR: libx264 version must be >= 0.98."; }
 enabled libxvid    && require  libxvid xvid.h xvid_global -lxvidcore