hg: bsd-port/bsd-port/hotspot: . OpenBSD nm(1) doesn't have -U or -j, so provide an OpenBSD specific

[kurt at intricatesoftware.com]

Changeset: 0d6f95e05945
Author:    kurt
Date:      2014-04-28 12:29 -0400
URL:       http://hg.openjdk.java.net/bsd-port/bsd-port/hotspot/rev/0d6f95e05945

. OpenBSD nm(1) doesn't have -U or -j, so provide an OpenBSD specific
implementation based on linux version. This change may be appropriate
for other BSD's as well if they use mapfiles.

! make/bsd/makefiles/build_vm_def.sh