Hide gcc static analysis compiler (#4267)

The GCC compiler for "static analysis" was used before the work was merged in
GCC's trunk. There's no need to track the `devel/analyzer` branch anymore.

The C++ compiler is already hidden (d5b0e201).
This changes does the same for the C compiler.

fixes #4256

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>