Add example env files specifically for OmniOS

*** 127,136 ****
--- 127,138 ----
  file path=opt/onbld/bin/ws mode=0555
  file path=opt/onbld/bin/wsdiff mode=0555
  file path=opt/onbld/bin/xref mode=0555
  file path=opt/onbld/bin/xref.mk
  file path=opt/onbld/env/illumos
+ file path=opt/onbld/env/omnios-illumos-gate
+ file path=opt/onbld/env/omnios-illumos-omnios
  file path=opt/onbld/etc/SampleLinks
  file path=opt/onbld/etc/SamplePkgLinks
  file path=opt/onbld/etc/exception_lists/check_rtime
  file path=opt/onbld/etc/exception_lists/interface_check
  file path=opt/onbld/etc/exception_lists/interface_cmp