squid_kerb_auth fails to compile after ipv6 changes

helpers/negotiate_auth/squid_kerb_auth

squid_kerb_auth.c: In function ‘gethost_name’:
squid_kerb_auth.c:93: warning: implicit declaration of function ‘xgetaddrinfo’
squid_kerb_auth.c:95: warning: implicit declaration of function ‘xgai_strerror’
squid_kerb_auth.c:95: warning: format ‘%s’ expects type ‘char *’, but argument 5 has type ‘int’
squid_kerb_auth.c:96: warning: implicit declaration of function ‘xfreeaddrinfo’
squid_kerb_auth.c:105: warning: implicit declaration of function ‘xgetnameinfo’
squid_kerb_auth.c:107: warning: format ‘%s’ expects type ‘char *’, but argument 5 has type ‘int’