* The updatecheckui lib is part of that module; should its scp entry also be
marked ComponentCondition="ISCHECKFORPRODUCTUPDATES=1"?

* unpack_update (and other scripts as well?) need only be generated if
ENABLE_ONLINE_UPDATE.

* It is inconsistent that there is a distinct onlineupdate.xcd not merged into
main.xcd, while the updchk and updatecheckui component files are merged into
the global services.rdb.

* The updchk res file should also go into (a resource sub-module of) the
optional online update module.