[patch] libstdc++/60421 (again) Loop in std::this_thread sleep functions

[Jonathan Wakely]

This fixes part of PR 60421 by looping in this_thread::sleep_for when
it is interrupted by a signal, and looping in this_thread::sleep_until
to handle clock adjustments.

There are still problems with integer overflow/wrapping in sleep_for,
which still need to be addressed somehow. Maybe using the new
overflow-checking built-ins.

Tested powerpc64le-linux, committed to trunk.

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