- Honor and use $RPM_OPT_FLAGS
    - define VERSUFFIX to Fedora version-release, so that people can tell this
        is a patched / customized build
    - Use gcc-core and gcc-g++ tarballs instead of the monolithic tarball
    - Run contrib/gcc_update --touch after applying our patches
    - In general, building GCC is not smp-safe, remove smpflags to play it safe
    - Remove not usefull install-tools binaries
    - Change %{_libdir} into /usr/lib as gcc always installs its files under
        /usr/lib