[Bug libstdc++/103187] std::counting_semaphore::try_acquire_for does not unblock during wait duration

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103187

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've backported that fix for GCC 11.3 but I want to keep this open to get to
the bottom of the underlying bug.