RFR: 8280178: Remove os:: API's that just call system API's

[Ioi Lam]

On Wed, 19 Jan 2022 19:03:43 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this change to remove unneeded definitions for close(), read(), and socket() from class os in os.hpp.  The definitions aren't needed because, for all platforms, these functions just call the host operating system versions.
> 
> The fix was tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.
> 
> Thanks, Harold

LGTM

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7145