Keeping rtems-gcc-head-newlib-head.cfg up to date

The RSB supports git commands and you can make it access a Git repo. We have moved away from doing this for a few reasons:

  1. Git repos in configurations slows down scanning and downloading all the sources. This is done when making a release or update the RTEMS file cache.
  2. The hash in the configuration is a known build point. The HEAD tools are considered unstable and user beware however at least one person, the commit author, has built an architecture.

GitLab provides a low overhead way to commit and get a hash merged.

I have added a new topic on Separate RSB Configurations to help explain how to use those to manage a git based build of GCC head.