avcodec/codec_internal: Add macro to set AVCodec.long_name

It reduces typing: Before this patch, there were 105 codecs
whose long_name-definition exceeded the 80 char line length
limit. Now there are only nine of them.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/codec_internal.h

@@ -23,6 +23,7 @@
 
 #include "libavutil/attributes.h"
 #include "codec.h"
+#include "config.h"
 
 /**
  * The codec is not known to be init-threadsafe (i.e. it might be unsafe
@@ -257,6 +258,12 @@ typedef struct FFCodec {
     const uint32_t *codec_tags;
 } FFCodec;
 
+#if CONFIG_SMALL
+#define CODEC_LONG_NAME(str) .p.long_name = NULL
+#else
+#define CODEC_LONG_NAME(str) .p.long_name = str
+#endif
+
 #define FF_CODEC_DECODE_CB(func)                          \
     .cb_type           = FF_CODEC_CB_TYPE_DECODE,         \
     .cb.decode         = (func)