RFR(xs): 8140648: Clean up remnants of fork1() from non-solaris platforms

[Thomas Stüfe]

Hi all,

please review and sponsor this little cleanup change. It removes remnants
of fork1() from AIX, BSD, Linux.

See pervious discussion here:
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2015-October/016098.html

webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/8140648/webrev.00/webrev/
bug report: https://bugs.openjdk.java.net/browse/JDK-8140648

Thanks,

Thomas