[Bug ada/114065] gnat build with -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 fails on 32bit archs

[nicolas at debian dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114065

--- Comment #16 from Nicolas Boulenguez <nicolas at debian dot org> ---
This 3rd attempt does the requested split.
It fixes all build errors on Debian/amd64.
The new Ada.Calendar.Clock returns sensible results.
In other words, it seems ready for review.