Extend PATH from login(1)/setusercontext(3) instead of overriding.

OK millert@

src/etc/skel/dot.cshrc

@@ -1,4 +1,4 @@
-# $OpenBSD: dot.cshrc,v 1.8 2018/02/02 02:29:54 yasuoka Exp $
+# $OpenBSD: dot.cshrc,v 1.9 2020/01/23 20:56:11 okan Exp $
 #
 # csh initialization
 
@@ -13,7 +13,7 @@ alias ll	ls -lsA
 alias tset	'set noglob histchars=""; eval `\tset -s \!*`; unset noglob histchars'
 alias z		suspend
 
-set path = (~/bin /bin /sbin /usr/{bin,sbin,X11R6/bin,local/bin,local/sbin,games})
+set path = (~/bin $path /usr/games)
 
 if ($?prompt) then
 	# An interactive shell -- set some stuff up

src/etc/skel/dot.profile

@@ -1,6 +1,6 @@
-# $OpenBSD: dot.profile,v 1.5 2018/02/02 02:29:54 yasuoka Exp $
+# $OpenBSD: dot.profile,v 1.6 2020/01/23 20:56:11 okan Exp $
 #
 # sh/ksh initialization
 
-PATH=$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin:/usr/games
+PATH=$HOME/bin:$PATH:/usr/games
 export PATH HOME TERM