lsws: define version in SWScaler class

The version number is useful to check the libavutil version against which
the library was compiled at run-time, which in turn may be useful to deal
with binary compatibility issues.

libswscale/options.c

@@ -71,6 +71,7 @@ const AVClass sws_context_class = {
     .item_name  = sws_context_to_name,
     .option     = options,
     .category   = AV_CLASS_CATEGORY_SWSCALER,
+    .version    = LIBAVUTIL_VERSION_INT,
 };
 
 const AVClass *sws_get_class(void)

libswscale/version.h

@@ -28,7 +28,7 @@
 
 #define LIBSWSCALE_VERSION_MAJOR 2
 #define LIBSWSCALE_VERSION_MINOR 1
-#define LIBSWSCALE_VERSION_MICRO 102
+#define LIBSWSCALE_VERSION_MICRO 103
 
 #define LIBSWSCALE_VERSION_INT  AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
                                                LIBSWSCALE_VERSION_MINOR, \