hg: jdk/sandbox: Some WSL hacks. Sort of compiles.

[magnus.ihse.bursie at oracle.com]

Changeset: 544af5f58a32
Author:    ihse
Date:      2020-06-11 17:12 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/544af5f58a32

Some WSL hacks. Sort of compiles.

! make/autoconf/basic_windows.m4
! make/autoconf/configure.ac
! make/autoconf/toolchain.m4
! make/autoconf/toolchain_windows.m4
! make/common/NativeCompilation.gmk
! make/scripts/fixpath.sh