hg: jdk/sandbox: New patch from Andrew Luo

Mon Dec 17 17:41:33 UTC 2018

Changeset: 168830ded68a
Author:    erikj
Date:      2018-12-17 09:35 -0800
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/168830ded68a

New patch from Andrew Luo
1. Got rid of EXECUTABLE_SUFFIX in favor of EXE_SUFFIX, which had to move earlier in the sequence
2. Use  instead of .exe literal per Magnus' feedback
3. Added information about WSL versioning to build, similar to Cygwin
4. Updated building.md and building.html with WSL build instructions

! doc/building.html
! doc/building.md
! make/autoconf/basics.m4
! make/autoconf/basics_windows.m4
! make/autoconf/boot-jdk.m4
! make/autoconf/spec.gmk.in
! make/autoconf/toolchain.m4