Small change to comment - missing word "if" in Deliver.mk for
gb_Deliver_CLEARONDELIVERY

Change-Id: I9b98da880d6fc949d831343b76124aa7c8c7cc62
Reviewed-on: https://gerrit.libreoffice.org/3205Reviewed-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Tested-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>