RFR: 8327675: jspawnhelper should be built on all unix platforms

[Aleksey Shipilev]

On Fri, 8 Mar 2024 10:17:08 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> We should match the building of jspawnhelper in make/modules/java.base/Launcher.gmk with the usage for all unix platforms in src/java.base/unix/classes/java/lang/ProcessImpl.java.
> 
> Granted, the list of OSes in the makefile amounts to the current list of all Unix OSes in the JDK, but there is no need to have this logical disparity. 
> 
> This was inspired by the discovery in https://github.com/openjdk/jdk/pull/18112#discussion_r1517455696.

Looks good!

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18165#pullrequestreview-1924580539