Function process-kill-without-query is obsolete since 22.1 and no
longer exists in 27.

--- gnuserv-3.12.8-orig/gnuserv.el
+++ gnuserv-3.12.8/gnuserv.el
@@ -738,7 +738,7 @@
 	    (start-process "gnuserv" nil gnuserv-program)))
     (set-process-sentinel gnuserv-process 'gnuserv-sentinel)
     (set-process-filter gnuserv-process 'gnuserv-process-filter)
-    (process-kill-without-query gnuserv-process)
+    (set-process-query-on-exit-flag gnuserv-process nil)
     (setq allow-deletion-of-last-visible-frame t)
     (run-hooks 'gnuserv-init-hook)))