KCM: restore support for Solaris doors IPC mechanism (#379)

This patch restores support for the Solaris doors IPC mechanism, removed
from KCM when lib/ipc was added.

kdc/digest-service.c

@@ -273,6 +273,12 @@ main(int argc, char **argv)
 				    ntlm_service, context, &mach);
 	heim_sipc_timeout(60);
     }
+#endif
+#ifdef HAVE_DOOR_CREATE
+    {
+	heim_sipc door;
+	heim_sipc_service_door("org.h5l.ntlm-service", ntlm_service, NULL, &door);
+    }
 #endif
     {
 	heim_sipc un;