d_bg_s constructors (#46)

include/SSystem/SComponent/c_bg_s_chk.h

@@ -8,7 +8,7 @@ struct cBgD_Vtx_t : public Vec {};
 
 class cBgS_GrpPassChk {
 public:
-    virtual ~cBgS_GrpPassChk();
+    virtual ~cBgS_GrpPassChk() {}
 };
 
 class cBgS_PolyPassChk;

include/SSystem/SComponent/c_bg_s_gnd_chk.h

@@ -8,11 +8,13 @@
 class cBgS_GndChk : public cBgS_Chk, public cBgS_PolyInfo {
 public:
     cBgS_GndChk();
-    void SetPos(cXyz const*);
+    void SetPos(cXyz const* pos) {
+        m_pos = *pos;
+    }
     void SetPos(Vec const*);
     void PreCheck();
 
-    virtual ~cBgS_GndChk();
+    virtual ~cBgS_GndChk() {}
 
     f32 GetNowY() const { return mNowY; }
     void SetNowY(f32 y) { mNowY = y; }

include/SSystem/SComponent/c_bg_s_poly_info.h

@@ -13,7 +13,7 @@ private:
     /* 0x08 */ unsigned int mActorId;
 
 public:
-    cBgS_PolyInfo();
+    cBgS_PolyInfo() {}
     void ClearPi() {
         mPolyIndex = -1;
         mBgIndex = 0x100;
@@ -26,7 +26,7 @@ public:
     void SetPolyIndex(int);
     bool ChkBgIndex() const;
 
-    virtual ~cBgS_PolyInfo();
+    virtual ~cBgS_PolyInfo() {}
 
     u16 GetPolyIndex() const { return mPolyIndex; }
     u16 GetBgIndex() const { return mBgIndex; }