hg: jdk9/sandbox/hotspot: JEP-223-branch: Update copyright year to 2015 according to code review.

[magnus.ihse.bursie at oracle.com]

Changeset: dfc3f0b7d859
Author:    ihse
Date:      2015-06-10 15:38 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/hotspot/rev/dfc3f0b7d859

JEP-223-branch: Update copyright year to 2015 according to code review.

! make/windows/makefiles/debug.make
! make/windows/makefiles/fastdebug.make
! make/windows/makefiles/product.make
! test/runtime/6981737/Test6981737.java