[PATCH] Port GCC documentation to Sphinx

[Martin Liška]

Hello.

I'm sending the complete patch set that includes ChangeLog entries. Unfortunately,
majority of the patches are huge, that's why I sent like to a tarball:
https://splichal.eu/tmp/port-to-sphinx-v1.tar

The tarball contains the following patches:

19e06194746 Ada: port to Sphinx.
9a744ca431d Remove unused TEX files.
e624967b5e8 Port jit to new Sphinx layout.
8c4717b262a Build system: support Sphinx
d102880437e Add include directives for target macros.
08c3d3f0d8d Add RST files with config files.

Thanks,
Martin