[Bug ada/120106] replace hardcoded gnatmake commands with configuration variables

[ebotcazou at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120106

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> v02 passes GNATMAKE_FOR_BUILD via BASE_TARGET_EXPORT instead of
> EXTRA_TARGET_FLAGS.  Is this less ugly?

Yes, thanks, I'm going to apply it.