bug in mod_auth_kerb port.

[Dan Mahoney]

I just sent in a PR (haven't gotten the number back yet), whereby building 
mod_auth_kerb against apache22 (and attempting to run) will yield this 
error:

httpd: Syntax error on line 106 of /usr/local/etc/apache22/httpd.conf: 
Cannot load /usr/local/libexec/apache22/mod_auth_kerb.so into server: 
/usr/local/libexec/apache22/mod_auth_kerb.so: Undefined symbol 
"gsskrb5_register_acceptor_identity"

I'm not very familiar with the code, but does this seem like an easy fix?  
It works against the kerberos port, but not the base.

-Dan Mahoney