Scons: Specialize version checks for gcc and clang.
Scons: Specialize version checks for gcc and clang.

* At least Fedora 28 has strange stuff there, so go for the
  option designed to be used in this case.

* Also cleanup to always use the_cc_name over the_compiler which contains
  path for name based checks.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka