[Dev-luatex] Don't use sed -r

Hi, Taco. A minor issue: in the file /src/texk/web2c/luatexdir/get_svnversion.sh, please avoid the -r option since it is not supported by many sed programs. see http://www.opengroup.org/onlinepubs/000095399/utilities/sed.html for the POSIX standard. (GNU sed support the option, however, BSD style sed (like the one distributed in FreeBSD or Mac OS X think this is an illegal statement during compilation) Yue Wang