building asterisk and xmlstarlet

[Greg Troxel <gdt%lexort.com@localhost>]

I've been rebuilding for the branch, and found that asterisk19 would
fail:

  => Creating installation directories
  menuselect/menuselect --check-deps menuselect.makeopts
  menuselect/menuselect --check-deps menuselect.makeopts /tmp/work/comms/asterisk19/work/asterisk-19.8.1/pkgsrc.makeopts 
  Installing modules from channels...
  sh: 6: Syntax error: Bad substitution
  make[1]: *** [/tmp/work/comms/asterisk19/work/asterisk-19.8.1/Makefile.moddir_rules:110: install] Error 2
  gmake: *** [Makefile:580: channels-install] Error 2
  *** Error code 2

I tried to read the twisty makefiles etc. but didn't figure it out.

Then I uninstalled xmlstarlet (which isn't required by the Makefile) and
it built, which explains why it builds in bulk.

Is anyone else seeing this?

This might affect other versions.