Removal of GCC from the buildroot

As per Changes/Remove GCC from BuildRoot
<>, I'm
going to automatically add BuildRequires: gcc and/or BuildRequires: gcc-c++
to packages which fail to build with common messages (like gcc: command not
found, also autotools/cmake/meson are supported).

I'm going to do this tomorrow.

After which, I'm going to ask rel-eng to finally remove it from buildroot.
This will happen before mass rebuild. Stay tuned.