i686 Windows contrib bundles include 64-bit luac binary
i686-w64-mingw32 contribs 20140906 and 20141114 from http://downloads.videolan.org/pub/videolan/contrib/i686-w64-mingw32/ include a 64-bit luac binary, which does not run in a 32-bit compile environment. Older contribs included a 32-bit luac binary.