d_a_bg debug work + matching for retail (#2890)

src/d/d_bg_parts.cpp

@@ -2,6 +2,24 @@
 
 #include "JSystem/J3DGraphAnimator/J3DAnimation.h"
 
+int dBgp_c::registBg(fopAc_ac_c* i_actor) {
+    // NONMATCHING
+    return 0;
+}
+
+void dBgp_c::draw(fopAc_ac_c* i_actor) {
+    // NONMATCHING
+}
+
+int dBgp_c::execute(bool param_0) {
+    // NONMATCHING
+    return 0;
+}
+
+void dBgp_c::releaseBg() {
+    // NONMATCHING
+}
+
 static void dummy() {
     ((J3DAnmTextureSRTKey*)0)->getUpdateMaterialID(0);
     ((J3DAnmTextureSRTKey*)0)->getUpdateMaterialNum();