pp: bump major in git master to match what debian contains.

The ABI differences are negligible, but its easier for all if
all distros have libpostproc HEAD under the same soname and
debian bumped soname without consulting upstream, so as silly as
it is following this is probably the least pain for all.

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

libpostproc/postprocess.h

@@ -29,8 +29,8 @@
 
 #include "libavutil/avutil.h"
 
-#define LIBPOSTPROC_VERSION_MAJOR 51
-#define LIBPOSTPROC_VERSION_MINOR  2
+#define LIBPOSTPROC_VERSION_MAJOR 52
+#define LIBPOSTPROC_VERSION_MINOR  0
 #define LIBPOSTPROC_VERSION_MICRO 100
 
 #define LIBPOSTPROC_VERSION_INT AV_VERSION_INT(LIBPOSTPROC_VERSION_MAJOR, \