lavc: add PIX_FMT_GBR24P to align_dimensions()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/utils.c

@@ -166,6 +166,7 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int l
     case PIX_FMT_YUV444P9BE:
     case PIX_FMT_YUV444P10LE:
     case PIX_FMT_YUV444P10BE:
+    case PIX_FMT_GBR24P:
         w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
         h_align= 16;
         if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP || s->codec_id == CODEC_ID_H264 || s->codec_id == CODEC_ID_PRORES)