Add version bump and APIchanges entry for Add AV_PIX_FMT_VDPAU.

Also fix a lavu version typo in APIchanges.

doc/APIchanges

@@ -13,11 +13,14 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2013-01-12 - 169fb94 - lavu 52.4.0 - pixdesc.h
+  Add AV_PIX_FMT_VDPAU flag.
+
 2013-01-07 - 074a00d - lavr 1.1.0
   Add avresample_set_channel_mapping() for input channel reordering,
   duplication, and silencing.
 
-2012-12-29 - d8fd06c - lavu 52.2.1 - avstring.h
+2012-12-29 - d8fd06c - lavu 52.3.0 - avstring.h
   Add av_basename() and av_dirname().
 
 2012-11-11 - 5980f5d - lavu 52.2.0 - audioconvert.h

libavutil/version.h

@@ -37,7 +37,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 52
-#define LIBAVUTIL_VERSION_MINOR  3
+#define LIBAVUTIL_VERSION_MINOR  4
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \