hg: amber/amber: Automatic merge with default

[maurizio.cimadamore at oracle.com]

Changeset: 72b55e1d0f23
Author:    langtools at sthdev02.uk.oracle.com
Date:      2017-09-01 00:00 +0200
URL:       http://hg.openjdk.java.net/amber/amber/rev/72b55e1d0f23

Automatic merge with default

- common/autoconf/lib-elf.m4