Fix the FIXME -- OS X was clearly being stupid earlier. This works fine on real OSen.
Fix the FIXME -- OS X was clearly being stupid earlier. This works fine on real OSen.

svn path=/trunk/hubbub/; revision=4579

servo/libhubbub,Achal-Aggarwal/hibbub,Achal-Aggarwal/hibbub,prepare/netsurf_libhubbub,servo/libhubbub,adamwight/wmf-parsoid-libhubbub,adamwight/wmf-parsoid-libhubbub,Achal-Aggarwal/hibbub,Achal-Aggarwal/hibbub,prepare/netsurf_libhubbub,servo/libhubbub,prepare/netsurf_libhubbub,adamwight/wmf-parsoid-libhubbub,servo/libhubbub,prepare/netsurf_libhubbub,adamwight/wmf-parsoid-libhubbub,prepare/netsurf_libhubbub,servo/libhubbub,adamwight/wmf-parsoid-libhubbub,prepare/netsurf_libhubbub