avcodec/tableprint_vlc: Fix building with hardcoded tables

This has been broken in 25c8507818,
because the hacks for headers that are incompatible with building
for the host in libavcodec/tableprint_vlc.h have not been adjusted.

Moving AV_INPUT_BUFFER_PADDING_SIZE to defs.h which is valid for
both the target as well as the host allowed to remove some of the hacks.

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/tableprint_vlc.h

@@ -33,9 +33,7 @@
 #define av_realloc_f(p, o, n) NULL
 #define av_free(p) while(0)
 #define av_freep(p) while(0)
-#define AVCODEC_AVCODEC_H
-#define AVCODEC_INTERNAL_H
-#define AV_INPUT_BUFFER_PADDING_SIZE 64 // the value does not matter for this
+#define AVUTIL_INTERNAL_H
 #define avpriv_request_sample(...)
 #include "tableprint.h"
 #include "get_bits.h"