remove alternative declaration of h263_encode_init()

It's never called in any code compiled without CONFIG_ENCODERS.

Originally committed as revision 10655 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.h

@@ -833,11 +833,7 @@ void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
                    int dir);
 void ff_set_mpeg4_time(MpegEncContext * s);
 void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
-#ifdef CONFIG_ENCODERS
 void h263_encode_init(MpegEncContext *s);
-#else
-static void h263_encode_init(MpegEncContext *s) {assert(0);}
-#endif
 void h263_decode_init_vlc(MpegEncContext *s);
 int h263_decode_picture_header(MpegEncContext *s);
 int ff_h263_decode_gob_header(MpegEncContext *s);