hg: build-infra/jdk8: Add optimistic check to detect non-GNU make. Move GNU make version check to

[magnus.ihse.bursie at oracle.com]

Changeset: 28e3e08b9e6a
Author:    ihse
Date:      2012-10-22 13:59 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/28e3e08b9e6a

Add optimistic check to detect non-GNU make. Move GNU make version check to
the very top.

! common/makefiles/MakeBase.gmk
! common/makefiles/Makefile