[Bug ada/80007] --disable-bootstrap with gnat-5 leads to failed gnat-7 build on aarch64

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80007

--- Comment #2 from PeteVine <tulipawn at gmail dot com> ---
Right, I definitely used the same setup a few days ago minus
--disable-bootstrap.