*-rtems-{gcc|binutils}: remove ports

[mojca]

Authors of RTEMS would like us to remove outdated and defunct ports unless we actually fix them (but even in that case we cannot really do much with existing ports).

From Joel from RTEMS:

If you do not base your builds on the RSB, then you will have to be
exceedingly careful to make sure the tools are actually built correctly
with the correct configure options and patches. The configure options
don't change often but the patches would have to be tracked.

Beyond tracking upstream, there are also practical issues:

• We have two supported release branches and master. Plus each has
  15-20 architectures. That results in about 45-60 toolset combinations.
  You have to have the right architecture and RTEMS toolset to build
  RTEMS for a particular board. This is a huge multiplier.

• The RSB builds a single install or tarball per architecture/RTEMS version.
  It includes the correct automake, autoconf, binutils, gcc, newlib C library,
  and gdb. That doesn't match how you are packaging.

• How do your version numbers track back to the RSB and
  can a user confidently know the correspondence?

• We quit building binaries because it was a huge amount of disk space
  of questionable value. Plus it seemed people regularly mirrored the
  near terabyte of content, chewing up our bandwidth.

I would be prone to do nothing or wrap the RSB to provide a complete
coherent toolset that matches upstream.

Closes: https://trac.macports.org/ticket/31945

Description

Verification

Have you

• followed our Commit Message Guidelines?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?

• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[pmetzger]

Seems sane to me.

[macportsbot]

Travis Build #1751 Passed.

[pmetzger]

As there have been no other comments, I intend to do these pulls in about 12 hours.

[pmetzger]

Merged.