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

[Simon Tooke]

(reposting with a correction; the backport did not apply cleanly so I
have a webrev)

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

The patch (from JDK9 pre repo merge) applies with only a change to a
comment, 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

Proposed patch:
http://cr.openjdk.java.net/~stooke/webrevs/jdk-8150432-jdk8u/webrev.00/webrev.jdk.00/

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

Thank you for your time,

-Simon