hg: build-infra/jdk8: Add "gnumake" as program to search for valid make.

[magnus.ihse.bursie at oracle.com]

Changeset: 91e59d25c0c3
Author:    ihse
Date:      2012-10-15 09:52 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/91e59d25c0c3

Add "gnumake" as program to search for valid make.

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh