dwarf-fortress: re-include stonesense fix

This partially reverts commit dfc4744afd.

cc @matthewbauer

pkgs/games/dwarf-fortress/dfhack/default.nix

@@ -46,6 +46,7 @@ let
       fetchSubmodules = true;
     };
 
+    patches = [ ./fix-stonesense.patch ];
     nativeBuildInputs = [ cmake perl XMLLibXML XMLLibXSLT fakegit ];
     # We don't use system libraries because dfhack needs old C++ ABI.
     buildInputs = [ zlib SDL ]

pkgs/games/dwarf-fortress/dfhack/fix-stonesense.patch

@@ -0,0 +1,23 @@
+From f5be6fe5fb192f01ae4551ed9217e97fd7f6a0ae Mon Sep 17 00:00:00 2001
+From: Herwig Hochleitner <hhochleitner@gmail.com>
+Date: Sun, 1 Oct 2017 18:01:43 +0200
+Subject: [PATCH] include <GL/glext.h>
+
+this fixes `GLhandleARB` not being defined
+---
+ plugins/stonesense/common.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/plugins/stonesense/common.h b/plugins/stonesense/common.h
+index eb36691..ef45389 100644
+--- a/plugins/stonesense/common.h
++++ b/plugins/stonesense/common.h
+@@ -31,6 +31,8 @@ using namespace df::enums;
+ #include <allegro5/allegro_opengl.h>
+ #include <allegro5/utf8.h>
+ 
++#include <GL/glext.h>
++
+ // allegro leaks X headers, undef some of it here:
+ #undef TileShape
+ #undef None