hg: jdk/sandbox: More cleaning up.

[magnus.ihse.bursie at oracle.com]

Changeset: 523ac65569f1
Author:    ihse
Date:      2020-03-12 23:31 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/523ac65569f1

More cleaning up.

! make/common/JavaCompilation.gmk
! make/test/BuildMicrobenchmark.gmk