hg: jdk/sandbox: Misc cleanup after comparing with default.

[magnus.ihse.bursie at oracle.com]

Changeset: 7197eb4f4d46
Author:    ihse
Date:      2020-06-11 14:27 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/7197eb4f4d46

Misc cleanup after comparing with default.

! make/RunTestsPrebuilt.gmk
! make/autoconf/basic.m4
! make/autoconf/bootcycle-spec.gmk.in
! make/autoconf/build-aux/config.sub
! make/autoconf/toolchain_windows.m4