Fix warmux build with clang6.

OK bcallah@

games/warmux/Makefile

@@ -1,9 +1,9 @@
-# $OpenBSD: Makefile,v 1.13 2017/09/25 14:33:14 naddy Exp $
+# $OpenBSD: Makefile,v 1.14 2018/04/16 00:06:19 bluhm Exp $
 
 COMMENT=		free software clone of Worms(R) game concept
 
 DISTNAME=		warmux-11.04.1
-REVISION=		6
+REVISION=		7
 WRKDIST=		${WRKDIR}/warmux-11.04
 CATEGORIES=		games
 

games/warmux/patches/patch-src_interface_weapon_menu_cpp

@@ -0,0 +1,14 @@
+$OpenBSD: patch-src_interface_weapon_menu_cpp,v 1.1 2018/04/16 00:06:19 bluhm Exp $
+
+Index: src/interface/weapon_menu.cpp
+--- src/interface/weapon_menu.cpp.orig
++++ src/interface/weapon_menu.cpp
+@@ -391,7 +391,7 @@ void WeaponsMenu::Draw()
+ Weapon * WeaponsMenu::UpdateCurrentOverflyItem(const Polygon * poly)
+ {
+   if (!show)
+-    return false;
++    return NULL;
+   const std::vector<PolygonItem *>& items = poly->GetItem();
+   WeaponMenuItem * tmp;
+   Interface::GetInstance()->SetCurrentOverflyWeapon(NULL);

games/warmux/patches/patch-src_map_tile_h

@@ -0,0 +1,15 @@
+$OpenBSD: patch-src_map_tile_h,v 1.1 2018/04/16 00:06:19 bluhm Exp $
+
+Index: src/map/tile.h
+--- src/map/tile.h.orig
++++ src/map/tile.h
+@@ -38,7 +38,8 @@ class Tile : public Rectanglei
+ public:
+   typedef struct
+   {
+-    uint16_t index, new_crc;
++    uint32_t index;
++    uint16_t new_crc;
+   } SynchTileInfo;
+   typedef std::vector<SynchTileInfo> SynchTileList;
+