hg: jdk/sandbox: Clean up some stuff in fake spec.

[magnus.ihse.bursie at oracle.com]

Changeset: cd05c5ba480a
Author:    ihse
Date:      2017-11-27 14:31 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/cd05c5ba480a

Clean up some stuff in fake spec.

! make/RunTestsPrebuilt.gmk
! make/RunTestsPrebuiltSpec.gmk