The check_for_module_config procedure was used to ensure that the user
actually meant to build a module given on the command line that doesn't
match any in the rc file.
This is currently superseded by a separate check that doesn't allow
*any* module to build if it's not present in the rc file. My intention
is to allow this check to pass if the module matches either the internal
built-in config (which I haven't implemented yet) or the
kde_projects.xml (which I haven't implemented the special case for).
Either way this check will remain redundant, so remove it.