This unbreaks static compilation against libav when using pkg-config,
like mplayer2 does

Taken from on a patch from "Uoti Urpal <u...@mplayer2.org>"
http://repo.or.cz/w/FFMpeg-mirror/mplayer-patches.git/commitdiff/65e612b5943fe79a6aaf83c0f48a1e4a0f739ffc?hp=0d0f1bc11ec7c8f81a61c1fa4a6bc0048ad10f30
---
 configure |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 32c3544..09dfb80 100755
--- a/configure
+++ b/configure
@@ -2840,6 +2840,7 @@ for thread in $THREADS_LIST; do
 done
 
 check_lib math.h sin -lm
+enabled sin && LIBM="-lm"
 enabled vaapi && require vaapi va/va.h vaInitialize -lva
 
 check_mathfunc exp2
@@ -3425,10 +3426,10 @@ Cflags: -I\${includedir}
 EOF
 }
 
-pkgconfig_generate libavutil "Libav utility library" "$LIBAVUTIL_VERSION"
+pkgconfig_generate libavutil "Libav utility library" "$LIBAVUTIL_VERSION" 
"$LIBM"
 pkgconfig_generate libavcodec "Libav codec library" "$LIBAVCODEC_VERSION" 
"$extralibs"
 pkgconfig_generate libavformat "Libav container format library" 
"$LIBAVFORMAT_VERSION" "$extralibs" "libavcodec = $LIBAVCODEC_VERSION"
 pkgconfig_generate libavdevice "Libav device handling library" 
"$LIBAVDEVICE_VERSION" "$extralibs" "libavformat = $LIBAVFORMAT_VERSION"
 pkgconfig_generate libavfilter "Libav video filtering library" 
"$LIBAVFILTER_VERSION" "$extralibs"
-pkgconfig_generate libpostproc "Libav post processing library" 
"$LIBPOSTPROC_VERSION"
-pkgconfig_generate libswscale "Libav image rescaling library" 
"$LIBSWSCALE_VERSION" "" "libavutil = $LIBAVUTIL_VERSION"
+pkgconfig_generate libpostproc "Libav post processing library" 
"$LIBPOSTPROC_VERSION" "" "libavutil = $LIBAVUTIL_VERSION"
+pkgconfig_generate libswscale "Libav image rescaling library" 
"$LIBSWSCALE_VERSION" "$LIBM" "libavutil = $LIBAVUTIL_VERSION"
-- 
1.7.0.4

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