hg: portola/portola: Add limited support for musl to config.sub

[mikael.vidstedt at oracle.com]

Changeset: 3441a52c7922
Author:    mikael
Date:      2017-04-11 16:14 -0700
URL:       http://hg.openjdk.java.net/portola/portola/rev/3441a52c7922

Add limited support for musl to config.sub

! common/autoconf/build-aux/config.sub