hg: jdk10/hs: 8174231: Factor out and share PlatformEvent and Parker code for POSIX systems

[david.holmes at oracle.com]

Changeset: ad2e99486e1f
Author:    dholmes
Date:      2017-05-30 17:03 -0400
URL:       http://hg.openjdk.java.net/jdk10/hs/rev/ad2e99486e1f

8174231: Factor out and share PlatformEvent and Parker code for POSIX systems
Reviewed-by: ihse, erikj

! common/autoconf/flags.m4
! common/autoconf/generated-configure.sh