nut prefers extradata style global headers

Originally committed as revision 4396 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/nut.c

@@ -1445,6 +1445,7 @@ static AVOutputFormat nut_oformat = {
     nut_write_header,
     nut_write_packet,
     nut_write_trailer,
+    .flags = AVFMT_GLOBALHEADER,
 };
 #endif //CONFIG_ENCODERS
 

tests/libav.regression.ref

@@ -25,8 +25,8 @@ c85c98bb1c9a5fe833eed5d23fbf8499 *./data/b-libav.ffm
 55d26d5f682f75fa57a5c126056c4c31 *./data/b-libav.mov
 369865 ./data/b-libav.mov
 ./data/b-libav.mov CRC=48f5a90d
-ec525a567d12e43a0f485b60a270c496 *./data/b-libav.nut
-332415 ./data/b-libav.nut
+7c1a4d31acaaeaf172f59367e927f72c *./data/b-libav.nut
+332358 ./data/b-libav.nut
 ./data/b-libav.nut CRC=ccab3a27
 29a2c312bbc5b187491183a918556475 *./data/b-libav.dv
 3600000 ./data/b-libav.dv