xinit: Add a patch to generate the magic cookie for authentication

This should fix many authentication issues (sometimes manifesting as
a plain root weave and cursor but no apps on startx), particularly when ssh
X11 forwarding is involved.

This issue appears to have existed since XFree86 4.3.

x11/xinit/Makefile

@@ -7,6 +7,7 @@
 
 PORTNAME=	xinit
 PORTVERSION=	1.0.4
+PORTREVISION=	1
 CATEGORIES=	x11
 
 MAINTAINER=	x11@FreeBSD.org

x11/xinit/files/patch-startx.cpp

@@ -0,0 +1,48 @@
+commit fc6cc81be41af58ffd996994e1325dd072a9ab34
+Author: Eric Anholt <eric@anholt.net>
+Date:   Fri Jul 13 15:34:43 2007 -0700
+
+    Use /dev/random to generate the cookie if mcookie is unavailable.
+    
+    Setting XAUTHORITY without having actually generated a cookie and created
+    .Xauthority led to issues if somebody like ssh later came around and made the
+    .Xauthority file for their own setup.  So, simply make it so that we never
+    fail to create one.
+
+diff --git a/startx.cpp b/startx.cpp
+index eba83b8..f4e24fd 100644
+--- startx.cpp
++++ startx.cpp
+@@ -170,7 +170,6 @@ fi
+ 
+ removelist=
+ 
+-#if defined(HAS_COOKIE_MAKER) && defined(MK_COOKIE)
+ XCOMM set up default Xauth info for this machine
+ case `uname` in
+ Linux*)
+@@ -186,7 +185,15 @@ Linux*)
+ esac
+ 
+ authdisplay=${display:-:0}
++#if defined(HAS_COOKIE_MAKER) && defined(MK_COOKIE)
+ mcookie=`MK_COOKIE`
++#else
++mcookie=`dd if=/dev/random bs=16 count=1 2>/dev/null | hexdump -e \\"%08x\\"`
++if x"$mcookie" = x; then
++                echo "Couldn't create cookie"
++                exit 1
++fi
++#endif
+ dummy=0
+ 
+ XCOMM create a file with auth information for the server. ':0' is a dummy.
+@@ -215,8 +222,6 @@ EOF
+     fi
+ done
+ 
+-#endif
+-
+ #if defined(__SCO__) || defined(__UNIXWARE__)
+ if [ "$REMOTE_SERVER" = "TRUE" ]; then
+         exec SHELL_CMD ${client}