OS-1823 git-pbchk should not depend on mercurial

*** 169,178 ****
--- 169,180 ----
  file path=opt/onbld/lib/python2.6/onbld/Checks/ProcessCheck.pyc mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Checks/__init__.py mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Checks/__init__.pyc mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/Backup.py mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/Backup.pyc mode=0444
+ file path=opt/onbld/lib/python2.6/onbld/Scm/Ignore.py mode=0444
+ file path=opt/onbld/lib/python2.6/onbld/Scm/Ignore.pyc mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/Version.py mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/Version.pyc mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/WorkSpace.py mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/WorkSpace.pyc mode=0444
  file path=opt/onbld/lib/python2.6/onbld/Scm/__init__.py mode=0444