Use HAVE_UTMPX_H to check if the system does or does not  use utmpx files.
Use HAVE_UTMPX_H to check if the system does or does not  use utmpx files.

Minor restructuring for maintainability.


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@919 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal