[RFA/testsuite/ada] re-implement make clean & distclean

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

The current implementation for make clean requires us that we update
the EXECUTABLES list each time we add a new testcase. It was a vague
copy/paste of some code I probably found in one of the nearby Makefiles...
It was causing me a bit of grief that certain files would not be deleted
when I did a "make clean", in particular the executables produced by
gnatmake. I decided to replace this with an approach we have been using
with great success in our own testsuite for years...

2006-12-31  Joel Brobecker  <brobecker@adacore.com>

        * gdb.ada/Makefile.in (EXECUTABLES): Delete.
        (MISCELLANEOUS): Delete.
        (clean): Re-implement.
        (mostlyclean): Likewise.

Tested on my x86-linux laptop.  Any objection?

Thank you,
-- 
Joel

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