[jdk11u-dev] RFR: 8261652: Remove some dead comments from os_bsd_x86

[Paul Hohensee]

On Wed, 2 Jun 2021 20:53:56 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> This is a  backport of 8261652.
> This patch removes some dead comment about older macos and removes double inclusion of pthread.h
> Comment location is slightly different from jdk17, but since it is a comment I would call this effectively clean backport.
> This is a soft prerequest for macarm.

Marked as reviewed by phh (Reviewer).

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/11