[ruby-core:115425] [Ruby master Bug#20010] Backport: Fix compile error on older systems without clock_get*

20 Nov 2023

      Issue #20010 has been reported by Bo98 (Bo Anderson).

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Bug #20010: Backport: Fix compile error on older systems without clock_get*
https://bugs.ruby-lang.org/issues/20010

* Author: Bo98 (Bo Anderson)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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Commit 84a12d657848dfb54f8cc556d344f017a793e95a

This fixes a build regression in 3.2.
3.1 and earlier are not affected.

Cherry-pick is trivial: https://github.com/ruby/ruby/pull/8948
and the risk is very low.

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