exec-754315: Enable stripping of strings from gcli.properties
exec-754315: Enable stripping of strings from gcli.properties

Some commands are included in the web build of GCLI, but not in the
Firefox build, so we need a way to exclude their strings from
gcli.properties.

Signed-off-by: Joe Walker <7a17872fbb32c7d760c9a16ee3076daead11efcf@mozilla.com>

mozilla/gcli,joewalker/gcli,joewalker/gcli,mozilla/gcli,mozilla/gcli