Finally, make sure vms_term_sock.c is built on VMS

Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

Configurations/10-main.conf

@@ -1774,7 +1774,7 @@ sub vms_info {
         dso_scheme       => "vms",
         thread_scheme    => "pthreads",
 
-        apps_aux_src     => "vms_decc_init.c",
+        apps_aux_src     => "vms_decc_init.c vms_term_sock.c",
     },
 
     "vms-alpha" => {