upstream: Revert previous two commits

It turns out we still support pre-auth compression on the client.
Therefore revert the previous two commits:

date: 2018/07/06 09:06:14;  author: sf;  commitid: yZVYKIRtUZWD9CmE;
 Rename COMP_DELAYED to COMP_ZLIB

 Only delayed compression is supported nowadays.

 ok markus@

date: 2018/07/06 09:05:01;  author: sf;  commitid: rEGuT5UgI9f6kddP;
 Remove leftovers from pre-authentication compression

 Support for this has been removed in 2016.
 COMP_DELAYED will be renamed in a later commit.

 ok markus@

OpenBSD-Commit-ID: cdfef526357e4e1483c86cf599491b2dafb77772
diff --git a/servconf.c b/servconf.c
index f5272b0..97c268e 100644
--- a/servconf.c
+++ b/servconf.c
@@ -1,5 +1,5 @@
 
-/* $OpenBSD: servconf.c,v 1.336 2018/07/06 09:06:14 sf Exp $ */
+/* $OpenBSD: servconf.c,v 1.337 2018/07/09 13:37:10 sf Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -349,7 +349,7 @@
 		options->permit_user_env_whitelist = NULL;
 	}
 	if (options->compression == -1)
-		options->compression = COMP_ZLIB;
+		options->compression = COMP_DELAYED;
 	if (options->rekey_limit == -1)
 		options->rekey_limit = 0;
 	if (options->rekey_interval == -1)
@@ -1170,8 +1170,8 @@
 	{ NULL, -1 }
 };
 static const struct multistate multistate_compression[] = {
-	{ "yes",			COMP_ZLIB },
-	{ "delayed",			COMP_ZLIB },
+	{ "yes",			COMP_DELAYED },
+	{ "delayed",			COMP_DELAYED },
 	{ "no",				COMP_NONE },
 	{ NULL, -1 }
 };