hg: jdk/sandbox: Improvements in UTIL_REQUIRE_PROGS, and use it all the time, more or less.

[magnus.ihse.bursie at oracle.com]

Changeset: f077334eebda
Author:    ihse
Date:      2020-07-03 23:23 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/f077334eebda

Improvements in UTIL_REQUIRE_PROGS, and use it all the time, more or less.

! make/RunTestsPrebuiltSpec.gmk
! make/autoconf/basic_tools.m4
! make/autoconf/basic_windows.m4
! make/autoconf/spec.gmk.in
! make/autoconf/util.m4
! make/autoconf/util_paths.m4