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>
(cherry picked from commit 649c158e8c)

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

libpostproc/postprocess.c

@@ -89,6 +89,9 @@ try to unroll inner for(x=0 ... loop to avoid these damn if(x ... checks
 #include "postprocess_internal.h"
 #include "libavutil/avstring.h"
 
+#include "libavutil/ffversion.h"
+const char postproc_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
+
 unsigned postproc_version(void)
 {
     av_assert0(LIBPOSTPROC_VERSION_MICRO >= 100);