README: Update binary locations
README: Update binary locations

Signed-off-by: Derek Buitenhuis <aff7d637ede26ea82e5226e01b697996cc52e526@gmail.com>

mstorsjo/c99-to-c89,mstorsjo/c99-to-c89,libav/c99-to-c89,libav/c99-to-c89