[Bug libstdc++/93325] libstdc++ wrongly uses direct clock_gettime syscall on non-glibc, breaks time64

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93325

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> In general we can't use link tests in configure, for reasons related to
> cross-compilers that I don't understand.

As far as I can tell, that's only relevant for bare metal targets, which is why
I think link tests are OK for hosted linux* targets.