hg: portola/portola: Force setting LD_LIBRARY_PATH in launcher for musl

[mikael.vidstedt at oracle.com]

Changeset: 757c7a9f7304
Author:    mikael
Date:      2017-04-12 15:26 -0700
URL:       http://hg.openjdk.java.net/portola/portola/rev/757c7a9f7304

Force setting LD_LIBRARY_PATH in launcher for musl

! common/autoconf/buildjdk-spec.gmk.in
! common/autoconf/platform.m4
! common/autoconf/spec.gmk.in