Various debug conditional compilation cleanup (#2915)

* Global: Define DEBUG as 0 if not already defined

* Clean up DEBUG-guarded code

src/d/actor/d_a_obj_rgate.cpp

@@ -239,9 +239,7 @@ int daObjRgate_c::Create() {
                           l_cull_box.max.y, l_cull_box.max.z);
 
     if (dComIfG_Bgsp().Regist(mpBgW, this)) {
-#ifdef DEBUG
-        OSReport_Error("キコルの門：ＢＧ登録失敗しました\n");
-#endif
+        OS_REPORT_ERROR("キコルの門：ＢＧ登録失敗しました\n");
         return 0;
     } else {
         for (u16 i = 0; i < mpGateModel->getModelData()->getJointNum(); i++) {
@@ -847,9 +845,7 @@ int daObjRgate_c::Draw() {
 int daObjRgate_c::Delete() {
     if (mpBgW != NULL && mpBgW->ChkUsed()) {
         if (dComIfG_Bgsp().Release(mpBgW)) {
-#ifdef DEBUG
-            OSReport("Release Error\n");
-#endif
+            OS_REPORT("Release Error\n");
         }
     }