avformat/img2: remove useless 'pix' duplicated entry.

The second entry will never be selected, so let's save some bytes in the
library.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/img2.c

@@ -57,7 +57,6 @@ static const IdStrMap img_tags[] = {
     { AV_CODEC_ID_TIFF,       "tif"      },
     { AV_CODEC_ID_SGI,        "sgi"      },
     { AV_CODEC_ID_PTX,        "ptx"      },
-    { AV_CODEC_ID_BRENDER_PIX,"pix"      },
     { AV_CODEC_ID_PCX,        "pcx"      },
     { AV_CODEC_ID_SUNRAST,    "sun"      },
     { AV_CODEC_ID_SUNRAST,    "ras"      },