More GCC compatibility/warning fixes (#3118)

* Wrap >4-char literals in a MULTI_CHAR macro

Modern compilers do not support CW's non-standard behavior with
>4 char literals. We can, however, use a constexpr function to
compute the u64 values directly. This leaves <=4 char literals
unchanged.

* Replace non-pointer usages of NULL with 0

* Define NULL to nullptr on C++11 and above

* Fix more -Wpointer-arith and -Woverflow warnings

* Replace u32/s32 with uintptr_t/intptr_t where appropriate

* JSUOutputStream: Overload all standard int types

1 files changed, 3 insertions, 3 deletions

diff --git a/src/d/actor/d_a_door_shutter.cpp b/src/d/actor/d_a_door_shutter.cpp
index 60bde824e6..59ef62eea2 100644
--- a/src/d/actor/d_a_door_shutter.cpp
+++ b/src/d/actor/d_a_door_shutter.cpp
@@ -306,7 +306,7 @@ int daDoor20_c::checkOpenMsgDoor(int* param_1) {
         *param_1 = 0;
         return 1;
     }
-    field_0x624.init(NULL, msgNo, NULL, NULL);
+    field_0x624.init(0, msgNo, NULL, NULL);
     int rv = field_0x624.checkOpenDoor(this, param_1);
     dMsgObject_endFlowGroup();
     return rv;
@@ -1380,7 +1380,7 @@ int daDoor20_c::createKey() {
             }
             field_0x5ec =
                 fopAcM_createChildFromOffset(PROC_Obj_Lv5Key, fopAcM_GetID(this), 0xffffffff,
-                                             &cStack_28, roomNo, &cStack_30, &scale, 0xffffffff, 0);
+                                             &cStack_28, roomNo, &cStack_30, &scale, -1, 0);
             break;
         default:
             OSReport_Error("シャッタードア：鍵タイプが不明です\n"); // Shutter door: key type unknown
@@ -1399,7 +1399,7 @@ int daDoor20_c::createKey() {
             }
             field_0x5ec =
                 fopAcM_createChildFromOffset(PROC_OBJ_KEYHOLE, fopAcM_GetID(this), 0xffffffff,
-                                             &cStack_28, roomNo, &cStack_30, &scale, 0xffffffff, 0);
+                                             &cStack_28, roomNo, &cStack_30, &scale, -1, 0);
         }
 
         current.pos = prevPos;