hg: jdk/sandbox: Rename msys to msys2. Misc fixes, mostly msys related.

[magnus.ihse.bursie at oracle.com]

Changeset: f81e3a7fb27e
Author:    ihse
Date:      2020-06-06 02:30 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/f81e3a7fb27e

Rename msys to msys2. Misc fixes, mostly msys related.

! make/autoconf/basic.m4
! make/autoconf/basic_tools.m4
! make/autoconf/basic_windows.m4
! make/autoconf/help.m4
! make/autoconf/platform.m4
! make/autoconf/spec.gmk.in
! make/autoconf/toolchain_windows.m4
! make/autoconf/util_paths.m4
! make/autoconf/util_windows.m4
! make/common/NativeCompilation.gmk