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

[doko at gcc dot gnu.org]

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

--- Comment #3 from Matthias Klose <doko at gcc dot gnu.org> ---
Created attachment 57763
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57763&action=edit
proposed patch

is that the correct approach? most likely has to be guarded with a configure
option.