multimedia/aom: regen distfile now that GH mirror is ready

Previous distfile was generated using the following commands, so
changes are mainly in timestamps.

$ git clone http://aomedia.googlesource.com/aom/; cd aom
$ git archive --format tar.gz --prefix aom-1.0.0/ \

-o $DISTDIR/jbeich-aom-v1.0.0_GH0.tar.gz v1.0.0