Provide NULL if it's missing; should fix or advance the dfly build.

games/xu4/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.2 2012/05/23 06:35:17 dholland Exp $
+$NetBSD: distinfo,v 1.3 2012/12/24 06:28:16 dholland Exp $
 
 SHA1 (xu4-1.0beta3.tar.gz) = baf1bbdc18088096ae11ea31aa497532b7e7124c
 RMD160 (xu4-1.0beta3.tar.gz) = f758fea4bc3034b19122651cfb725a88e0684960
@@ -18,6 +18,7 @@ SHA1 (patch-src_intro.cpp) = 5330d1bedb8e79750468d9463a016b041b7aa496
 SHA1 (patch-src_item.cpp) = 667498d2c8fcf4c2c35da0d9189d68c9b6a9baf5
 SHA1 (patch-src_lzw_u6decode.cpp) = 1dbf1cb0f24ad9d083f4a7fe666f1503c9647ab6
 SHA1 (patch-src_menuitem_cpp) = 400943827ddd59a9cff547765e87b30590569cb2
+SHA1 (patch-src_moongate.cpp) = b9edda01c2d405ac94082280a62e8169be66ba85
 SHA1 (patch-src_person.cpp) = b93703514429257ae4665ab7242c5dc1ead18c3c
 SHA1 (patch-src_savegame.cpp) = 6a0b43d29bd26fd2265953588ae82c950d14e6ba
 SHA1 (patch-src_screen.cpp) = bffaf51b9ac63112733d89c0b5e30370a695d45d

games/xu4/patches/patch-src_moongate.cpp

@@ -0,0 +1,17 @@
+$NetBSD: patch-src_moongate.cpp,v 1.1 2012/12/24 06:28:16 dholland Exp $
+
+Provide NULL if it's missing. Apparently Required on Dragonfly.
+
+--- src/moongate.cpp~	2004-06-01 15:07:45.000000000 +0000
++++ src/moongate.cpp
+@@ -11,6 +11,10 @@
+ #include "moongate.h"
+ #include "types.h"
+ 
++#ifndef NULL
++#define NULL 0
++#endif
++
+ typedef std::map<int, Coords> MoongateList; /* map moon phase to map coordinates */
+ 
+ MoongateList gates;