pthread-rwlock: Attempt to avoid test failure on some more machines

[Bruno Haible]

The CI reports a 'test-pthread-rwlock-waitqueue' failure also on the macOS
machines. The first patch attempts to avoid this failure.

But it means that the test needs 30 seconds on some more machines. So, some
packages might want to avoid it. To make this easy, I'm moving it to a
separate module.


2024-08-12  Bruno Haible  <bruno@clisp.org>

        pthread-rwlock tests: Move the waitqueue test into a separate module.
        * modules/pthread-rwlock-extra-tests: New file.
        * modules/pthread-rwlock-tests: Revert 2024-08-07 changes.
        (Depends-on): Add pthread-rwlock-extra-tests.

2024-08-12  Bruno Haible  <bruno@clisp.org>

        pthread-rwlock: Attempt to avoid test failure on some more machines.
        * tests/test-pthread-rwlock-waitqueue.c (STEP_INTERVAL): Bump the
        minimum interval to 20 ms on macOS.

0001-pthread-rwlock-Attempt-to-avoid-test-failure-on-some.patch
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0002-pthread-rwlock-tests-Move-the-waitqueue-test-into-a-.patch
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