[Ada] Large merge committed

[Florian Weimer]

Geert Bosch <bosch@gnat.com> writes:

> As the patch for these changes is 3.7MB, I have not sent it
> to the list. The patch has been tested by bootstrapping and
> library build on i686-pc-linux-gnu and sparc-sun-solaris2.8.

At least sinput-d.ads and sinput-d.adb are missing.  These files are
referenced in sprint.adb, so it's not just a makefile issue.
switch-c.ad[bs], adadecode.[ch], and switch-b.ad[bs] are further
candidates.