hg: bsd-port/bsd-port/hotspot: . FreeBSD still uses GNU nm, so take account of that and fix the handling

[glewis at eyesbeyond.com]

Changeset: 565a785b536e
Author:    Greg Lewis <glewis at eyesbeyond.com>
Date:      2014-11-21 18:10 -0800
URL:       http://hg.openjdk.java.net/bsd-port/bsd-port/hotspot/rev/565a785b536e

. FreeBSD still uses GNU nm, so take account of that and fix the handling
  of the symbol mapfile for the VM.

Submitted by:	Jung-uk Kim (jkim at FreeBSD.org)

! make/bsd/makefiles/build_vm_def.sh