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_kgate.cpp

@@ -259,9 +259,7 @@ int daObjKGate_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;
     }
 
@@ -336,7 +334,7 @@ int daObjKGate_c::create1st() {
         phase_state =
             MoveBGCreate(l_arcName[mNameArg], l_gateDzbIdx[mNameArg], NULL, heap_size, NULL);
         if (phase_state == cPhs_ERROR_e) {
-#ifdef DEBUG
+#if DEBUG
             OSReport("KGATE PARAM:%x\n", fopAcM_GetParam(this));
 #endif
             return phase_state;
@@ -956,9 +954,7 @@ int daObjKGate_c::Draw() {
 int daObjKGate_c::Delete() {
     if (mpBgW != NULL && mpBgW->ChkUsed()) {
         if (dComIfG_Bgsp().Release(mpBgW)) {
-#ifdef DEBUG
-            OSReport("Release Error\n");
-#endif
+            OS_REPORT("Release Error\n");
         }
     }