git: openjdk/jdk17u-dev: 8272811: Document the effects of building with _GNU_SOURCE in os_posix.hpp

[Matthias Baesken]

Changeset: c7744690
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2024-01-24 12:41:44 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/c774469089d487c0074ff2299eb16c9b5d4cfd70

8272811: Document the effects of building with _GNU_SOURCE in os_posix.hpp

Backport-of: c4c76e2f34f7e709f8b3c960d8c796ff4e2dc4a5

! src/hotspot/os/posix/os_posix.hpp