with krb5-config, hunt down gssapi.h and friends. Based partially on patch
from deengert at anl.gov.
For the MIT Kerberos bug against krb5-config related to this see:
http://krbdev.mit.edu/rt/Ticket/Display.html?id=2240
[auth2-gss.c gss-genr.c gss-serv.c monitor.c monitor.h monitor_wrap.c]
[monitor_wrap.h sshconnect2.c ssh-gss.h]
replace "gssapi" with "gssapi-with-mic"; from Simon Wilkinson;
test + ok jakob.
[auth2.c auth2-gss.c auth.h compat.c compat.h gss-genr.c gss-serv-krb5.c
gss-serv.c monitor.c monitor.h monitor_wrap.c monitor_wrap.h readconf.c
readconf.h servconf.c servconf.h session.c session.h ssh-gss.h
ssh_config.5 sshconnect2.c sshd_config sshd_config.5]
support GSS API user authentication; patches from Simon Wilkinson,
stripped down and tested by Jakob and myself.