hg: jdk/sandbox: 2 new changesets

[magnus.ihse.bursie at oracle.com]

Changeset: 368f00d06c51
Author:    ihse
Date:      2020-07-03 23:25 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/368f00d06c51

UTIL_CHECK_NONEMPTY for required tools

! make/autoconf/basic_tools.m4

Changeset: 1b755670c559
Author:    ihse
Date:      2020-07-03 23:25 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/1b755670c559

Docs

! make/autoconf/basic_tools.m4