hg: jdk/jdk: 8199347: Always use -Z7 for debug symbols when compiling on Windows

[magnus.ihse.bursie at oracle.com]

Changeset: cefb7b496d17
Author:    ihse
Date:      2018-03-09 00:28 +0100
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/cefb7b496d17

8199347: Always use -Z7 for debug symbols when compiling on Windows
Reviewed-by: erikj

! make/autoconf/flags-cflags.m4
! make/autoconf/spec.gmk.in
! make/common/NativeCompilation.gmk
! make/hotspot/lib/CompileGtest.gmk
! make/hotspot/lib/CompileJvm.gmk
! make/lib/Lib-jdk.hotspot.agent.gmk