re2-20161101-2.1

- Update to version 2016-11-01:
  * No upstream changelog available
- Drop no longer needed re2-gcc61.patch

- Fixup group and avoid rm indirection

- Drop releasenumber

- Version update to 2016-09-01 version
  * Various changes based on google needs, long changelog in upstream
    github repo
- Rebase spec on Fedora package
- Add patch to build with gcc 6.1:
  * re2-gcc61.patch

- Initial package version.