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)

Conflicts:

	libavdevice/avdevice.c
	libswresample/swresample.c

libavformat/utils.c

@@ -53,6 +53,9 @@
 #include "riff.h"
 #include "url.h"
 
+#include "libavutil/ffversion.h"
+const char av_format_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
+
 /**
  * @file
  * various utility functions for use within FFmpeg