Bump major of libavfilter for reference counted buffer API changes.

Applications that have been linked against an older release of Libav and pick up
updated libraries experience segmentation faults because they pick up the new
libavfilter, which assumes AVFrames have been allocated by libavutil and thus
contain new reference-counting related fields. This will break for AVFrames that
have been allocated by old libavcodec.

All scheduled API changes are deferred to the next bump.

doc/APIchanges

@@ -4,7 +4,7 @@ since the last major version increase.
 The last version increases were:
 libavcodec:    2013-03-xx
 libavdevice:   2013-03-xx
-libavfilter:   2012-06-22
+libavfilter:   2013-12-xx
 libavformat:   2013-03-xx
 libavresample: 2012-10-05
 libswscale:    2011-06-20

libavfilter/version.h

@@ -29,9 +29,9 @@
 
 #include "libavutil/avutil.h"
 
-#define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  11
-#define LIBAVFILTER_VERSION_MICRO  1
+#define LIBAVFILTER_VERSION_MAJOR  4
+#define LIBAVFILTER_VERSION_MINOR  0
+#define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
@@ -48,28 +48,28 @@
  */
 
 #ifndef FF_API_AVFILTERPAD_PUBLIC
-#define FF_API_AVFILTERPAD_PUBLIC           (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_AVFILTERPAD_PUBLIC           (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_FOO_COUNT
-#define FF_API_FOO_COUNT                    (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_FOO_COUNT                    (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_AVFILTERBUFFER
-#define FF_API_AVFILTERBUFFER               (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_AVFILTERBUFFER               (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_OLD_FILTER_OPTS
-#define FF_API_OLD_FILTER_OPTS              (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_OLD_FILTER_OPTS              (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_AVFILTER_OPEN
-#define FF_API_AVFILTER_OPEN                (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_AVFILTER_OPEN                (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_AVFILTER_INIT_FILTER
-#define FF_API_AVFILTER_INIT_FILTER         (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_AVFILTER_INIT_FILTER         (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_OLD_FILTER_REGISTER
-#define FF_API_OLD_FILTER_REGISTER          (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_OLD_FILTER_REGISTER          (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 #ifndef FF_API_NOCONST_GET_NAME
-#define FF_API_NOCONST_GET_NAME             (LIBAVFILTER_VERSION_MAJOR < 4)
+#define FF_API_NOCONST_GET_NAME             (LIBAVFILTER_VERSION_MAJOR < 5)
 #endif
 
 #endif /* AVFILTER_VERSION_H */