hg: jdk/submit: JDK-8212828 - enable posix-spawn on Linux and switch default

[thomas.stuefe at gmail.com]

Changeset: 33a3cb20aa70
Author:    stuefe
Date:      2018-10-29 16:06 +0100
URL:       http://hg.openjdk.java.net/jdk/submit/rev/33a3cb20aa70

JDK-8212828 - enable posix-spawn on Linux and switch default

! make/launcher/Launcher-java.base.gmk
! src/java.base/unix/classes/java/lang/ProcessImpl.java
! src/java.base/unix/native/jspawnhelper/jspawnhelper.c
! src/java.base/unix/native/libjava/ProcessImpl_md.c