hg: build-infra/jdk8: Make sure we test for local autoconf modification using hg in the correct

[magnus.ihse.bursie at oracle.com]

Changeset: 3dedb86d1026
Author:    ihse
Date:      2012-10-22 16:20 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/3dedb86d1026

Make sure we test for local autoconf modification using hg in the correct
directory. Also add check for modifications in custom source.

! common/autoconf/configure