hg: jdk9/sandbox: Add support for finding dot

[magnus.ihse.bursie at oracle.com]

Changeset: f4e7cc6a4c99
Author:    ihse
Date:      2017-03-29 12:21 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/f4e7cc6a4c99

Add support for finding dot

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in