12310 Add demangle(1) command

*** 20,29 ****
--- 20,30 ----
  #
  
  #
  # Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2019 OmniOS Community Edition (OmniOSce) Association.
+ # Copyright 2020 Joyent, Inc.
  #
  
  set name=pkg.fmri value=pkg:/developer/object-file@$(PKGVERS)
  set name=pkg.description \
      value="software development utilities, including ar, dis, dump, elfdump, elfedit, lex, lorder, mcs, nm, prof, ranlib, rpcgen, size, strip, tsort, and yacc"
*** 51,60 ****
--- 52,62 ----
  file path=usr/bin/$(ARCH64)/elfedit mode=0555
  file path=usr/bin/$(ARCH64)/mcs mode=0555
  file path=usr/bin/$(ARCH64)/nm mode=0555
  file path=usr/bin/$(ARCH64)/size mode=0555
  file path=usr/bin/ar mode=0555
+ file path=usr/bin/demangle mode=0555
  file path=usr/bin/dis mode=0555
  file path=usr/bin/dump mode=0555
  file path=usr/bin/elfdump mode=0555
  file path=usr/bin/elfedit mode=0555
  file path=usr/bin/error mode=0555
*** 93,102 ****
--- 95,105 ----
  file path=usr/share/lib/ccs/nceucform
  file path=usr/share/lib/ccs/ncform
  file path=usr/share/lib/ccs/nrform
  file path=usr/share/lib/ccs/yaccpar
  file path=usr/share/man/man1/ar.1
+ file path=usr/share/man/man1/demangle.1
  file path=usr/share/man/man1/dis.1
  file path=usr/share/man/man1/dump.1
  file path=usr/share/man/man1/elfdump.1
  file path=usr/share/man/man1/elfedit.1
  file path=usr/share/man/man1/gprof.1