hg: jdk9/sandbox: * Add help for pkg package handler.

[magnus.ihse.bursie at oracle.com]

Changeset: e468c4b2f335
Author:    ihse
Date:      2015-12-20 17:19 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/e468c4b2f335

* Add help for pkg package handler.
* Disable building SA on OpenBSD.
* Detect BSD flavours.

! common/autoconf/generated-configure.sh
! common/autoconf/help.m4
! common/autoconf/hotspot.m4
! common/autoconf/platform.m4