RFR 8055915: (ch) FileDispatcherImpl.truncate0 should use SetFileInformationByHandle

[Ivan Gerasimov]

Hello!

This is another cleanup proposal.
This change has already been reviewed once [1], though I had to withdraw 
it, as it turned out jdk9 was still tested on older machines at that time.
A few other changes that require Windows Vista or newer were integrated 
since then, so this change shouldn't now break anything.

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8055915
WEBREV: http://cr.openjdk.java.net/~igerasim/8055915/1/webrev/

The fix was built and successfully tested with existing regtests on all 
available platforms.

[1] http://mail.openjdk.java.net/pipermail/nio-dev/2014-August/002726.html

Sincerely yours,
Ivan