hg: amber/amber: Automatic merge with default

[maurizio.cimadamore at oracle.com]

Changeset: 2c9174da72e2
Author:    langtools at sthdev02.uk.oracle.com
Date:      2017-09-01 00:01 +0200
URL:       http://hg.openjdk.java.net/amber/amber/rev/2c9174da72e2

Automatic merge with default

- common/autoconf/lib-elf.m4