parse.y must only fetch IP addresses if FCGI mode is enabled for a server.
Otherwise, on IPv6 enabled-systems, a gotwebd unix-domain socket server
will still try to listen on IPv6 by default.

Found via debug log output:

config_getsock: name=localhost-unix_child id=3 server=localhost-unix \
	child_id=0 parent_id=1 type=fcgi ipv4=0 ipv6=1 socket_path=none

ok?
 
diff e087e1f6e7b926dcff23d90de416399c114d582e 93d778c7f2208a24a4a3f9f5ccf8c8abd0fcae7b
commit - e087e1f6e7b926dcff23d90de416399c114d582e
commit + 93d778c7f2208a24a4a3f9f5ccf8c8abd0fcae7b
blob - 6a19cc971eac7c808d5e66cf765ae45df9f34677
blob + 0ca15455603ce181da678196d0433365c1fc92df
--- gotwebd/parse.y
+++ gotwebd/parse.y
@@ -251,10 +251,13 @@ server		: SERVER STRING {
 			log_debug("adding server %s", $2);
 			free($2);
 		} '{' optnl serveropts2 '}' {
-			if (get_addrs(new_srv->fcgi_socket_bind,
-			    &new_srv->al, new_srv->fcgi_socket_port) == -1) {
-				yyerror("could not get tcp iface addrs");
-				YYERROR;
+			if (new_srv->fcgi_socket) {
+				if (get_addrs(new_srv->fcgi_socket_bind,
+				    &new_srv->al, new_srv->fcgi_socket_port)
+				    == -1) {
+					yyerror("could not get tcp iface addr");
+					YYERROR;
+				}
 			}
 		}
 		;