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_npc_grs.cpp

@@ -335,11 +335,7 @@ int daNpc_grS_c::ctrlJointCallBack(J3DJoint* i_joint, int param_1) {
 
 void daNpc_grS_c::setParam() {
     actionFunc oldAction = mpNextActionFn;
-#if DEBUG
-    u32 flags = 0x42;
-#else
-    u32 flags = 0xa;
-#endif
+    u32 flags = fopAc_AttnFlag_TALK_e | fopAc_AttnFlag_SPEAK_e;
 
     selectAction();