hg: build-infra/jdk9/hotspot: Re-enable use of mapfile for jsig library on solaris, it was mistakenly disabled there instead of on macosx

[ingemar.aberg at oracle.com]

Changeset: 6fe259e44442
Author:    iaberg
Date:      2015-12-15 14:22 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/6fe259e44442

Re-enable use of mapfile for jsig library on solaris, it was mistakenly disabled there instead of on macosx

! makefiles/CompileLibJsig.gmk