Missing word "if" in Deliver.mk

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>

solenv/gbuild/Deliver.mk

@@ -29,8 +29,8 @@
 gb_Deliver_GNUCOPY := $(GNUCOPY)
 
 # if ($true) then old files will get removed from the target location before
-# they are copied there. In multi-user environments, this is needed you need to
-# be the owner of the target file to be able to modify timestamps
+# they are copied there. In multi-user environments, if this is needed you need
+# to be the owner of the target file to be able to modify timestamps
 ifeq ($(strip gb_Deliver_HARDLINK),)
 gb_Deliver_CLEARONDELIVER := $(false)
 else