hg: jigsaw/jake: Fixed JDK-8146698: make images always creates the jdk/jre images

[erik.joelsson at oracle.com]

Changeset: 91af65298753
Author:    erikj
Date:      2016-01-12 11:14 +0100
URL:       http://hg.openjdk.java.net/jigsaw/jake/rev/91af65298753

Fixed JDK-8146698: make images always creates the jdk/jre images
Summary: Made source_tips only be recreated if they actually changed since last run

! make/Main.gmk
! make/common/MakeBase.gmk