hg: jdk/sandbox: Merge

[magnus.ihse.bursie at oracle.com]

Changeset: 6dee727a02ac
Author:    ihse
Date:      2020-05-14 19:18 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/6dee727a02ac

Merge

! make/autoconf/basic_tools.m4
! make/autoconf/toolchain_windows.m4
! make/autoconf/util_windows.m4
! make/common/NativeCompilation.gmk