use net_{read,write} instead of krb_net_{read,write} (krb_get_int, krb_put_int): include fallback of these for when we compile without krb4 git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@6181 ec53bebd-3082-4978-b11e-865c3cabbd6b