Add FFMPEG_VERSION into the binary libs

This simplifies identifying from which revision a binary of a lib came from

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/swresample.c

@@ -28,6 +28,9 @@
 
 #define ALIGN 32
 
+#include "libavutil/ffversion.h"
+const char swr_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
+
 unsigned swresample_version(void)
 {
     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);