[8u60] Request for approval 8079087: Add support for Cygwin 2.0

[Erik Joelsson]

Hello,

I would like to backport "8079087: Add support for Cygwin 2.0" so that 
the community may continue building jdk8u with the current versions of 
Cygwin. Patch from jdk9 applies cleanly.

Bug: https://bugs.openjdk.java.net/browse/JDK-8079087
JDK 9 review: 
http://mail.openjdk.java.net/pipermail/build-dev/2015-May/014897.html

/Erik