hg: build-infra/jdk8: Clean up Makefile, move most functions into separate MakeHelpers.gmk file to

[magnus.ihse.bursie at oracle.com]

Changeset: 4d8531631e43
Author:    ihse
Date:      2012-06-11 14:08 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/4d8531631e43

Clean up Makefile, move most functions into separate MakeHelpers.gmk file to
make overall structure of top-level Makefile more clear.

+ common/makefiles/MakeHelpers.gmk
! common/makefiles/Makefile