Mark list heads static. Patch by Diego Pettenò

Originally committed as revision 15548 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/bitstream_filter.c

@@ -20,7 +20,7 @@
 
 #include "avcodec.h"
 
-AVBitStreamFilter *first_bitstream_filter= NULL;
+static AVBitStreamFilter *first_bitstream_filter= NULL;
 
 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f){
     if(f) return f->next;

libavcodec/parser.c

@@ -22,7 +22,7 @@
 
 #include "parser.h"
 
-AVCodecParser *av_first_parser = NULL;
+static AVCodecParser *av_first_parser = NULL;
 
 AVCodecParser* av_parser_next(AVCodecParser *p){
     if(p) return p->next;

libavcodec/utils.c

@@ -79,7 +79,7 @@ void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
 }
 
 /* encoder management */
-AVCodec *first_avcodec = NULL;
+static AVCodec *first_avcodec = NULL;
 
 AVCodec *av_codec_next(AVCodec *c){
     if(c) return c->next;