[gtkada] cosmetic suggestions in Makefiles

[Björn Persson]

Emmanuel Briot wrote:
> There is no C++ in GtkAda, so I am not sure we should be using
> CPPFLAGS, which might in fact end up generating errors if there are
> C++ switches there. So I did not include that part.

CPPFLAGS is for parameters to CPP, the C Preprocessor. C++ compiler
parameters go in CXXFLAGS.

Björn Persson
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