upstream: add a SetEnv directive to ssh_config that allows setting

environment variables for the remote session (subject to the server accepting
them)

refactor SendEnv to remove the arbitrary limit of variable names.

ok markus@

OpenBSD-Commit-ID: cfbb00d9b0e10c1ffff1d83424351fd961d1f2be
diff --git a/scp.1 b/scp.1
index 8d251e3..b8886be 100644
--- a/scp.1
+++ b/scp.1
@@ -8,9 +8,9 @@
 .\"
 .\" Created: Sun May  7 00:14:37 1995 ylo
 .\"
-.\" $OpenBSD: scp.1,v 1.77 2018/02/23 07:38:09 jmc Exp $
+.\" $OpenBSD: scp.1,v 1.78 2018/06/09 03:01:12 djm Exp $
 .\"
-.Dd $Mdocdate: February 23 2018 $
+.Dd $Mdocdate: June 9 2018 $
 .Dt SCP 1
 .Os
 .Sh NAME
@@ -171,6 +171,7 @@
 .It PubkeyAuthentication
 .It RekeyLimit
 .It SendEnv
+.It SetEnv
 .It ServerAliveInterval
 .It ServerAliveCountMax
 .It StrictHostKeyChecking