[Bug 274238] Mk/Uses/ada.mk: Setting CC to gnatmake is wrong, use gcc instead

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274238

            Bug ID: 274238
           Summary: Mk/Uses/ada.mk: Setting CC to gnatmake is wrong, use
                    gcc instead
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: yuri@freebsd.org
          Reporter: nsonack@outlook.com
          Assignee: yuri@freebsd.org
             Flags: maintainer-feedback?(yuri@freebsd.org)

Created attachment 245404
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=245404&action=edit
Fix for CC/GNATMAKE

When setting USES=ada:12 CC gets set to gnatmake. This is wrong as it breaks
build systems where CC needs to build single C objects. E.g.:
https://poudriere.herrhotzenplotz.de/data/release-latest-main/2023-09-30_20h57m21s/logs/errors/ghdl-3.0.0_2.log

This patch instead sets CC to gcc and GNATMAKE to gnatmake.

I needed to do this in order to get cad/ghdl to build with lang/gnat12.
I have not tested this with any other ports but I assume that this was a hack
for some other port.
Therefore ports that depend on this hack may need to be patched separately, the
current USES ada.mk is simply wrong.

I will cross-link the bugs related to this later as I submit them.

NOTE: I had to file the bug in "Individual Ports" because the submission form
doesn't allow me to file bugs for the ports framework. Who knows...

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