GNAT ACT source tree

[Arnaud Charlet]

> I needed to use 5.00 as base compiler to avoid
> failures (due to warnings) on the new "Unreferenced" pragma which
> is present in ACT sources, I assume ACT is using either 3.16 or 5.00 as
> baseline compiler. I assume either Warnings (Off) or Makefile trickery
> are needed if we want to preserve 3.2 GNAT as base build compiler.

This was actually a transient error in our sources, which will be fixed
with the next mirror.

Arno