[8u] RFR backport of JDK-8150432: java/util/Locale/LocaleProviders.sh failed on Win10.

[Simon Tooke]

Hi, I'd like to request a backport of JDK-8150432.

The patch (from JDK9 pre repo merge) applies cleanly and fixes the issue
encountered by some JDK 8 developers who run tests on a newer version of
Cygwin than the test was written for.  If you look at
LocaleProviders.sh, it has many hard-coded OS versions with differing
behaviours and no explanation; but this fix (that I propose backporting)
exists and addresses the current issue.

Original bug: https://bugs.openjdk.java.net/browse/JDK-8150432

Original patch: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/91a26000bfb5

Thank you for your time,

-Simon