Move cmake download to later in configure script.
Move cmake download to later in configure script.

This allows you to run ./configure --help without forcing the download
of cmake (the download won't happen until we actually need it).

apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,apinf/api-umbrella