[Bug target/104117] gcc10 fails to build icu for ppc64 on 10.5.8 (direct access to a floating-point constant)

[vital.had at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104117

--- Comment #3 from Sergey Fedorov <vital.had at gmail dot com> ---
(In reply to Iain Sandoe from comment #1)
> most likely present on earlier branches.

Indeed, gcc7.5 likewise failed to build icu for ppc64.