Fix dBgS_CaptPoly forward declares

include/d/d_bg_s_cap_poly.h

@@ -4,7 +4,7 @@
 #include "d/d_bg_s_chk.h"
 #include "SSystem/SComponent/c_m3d_g_aab.h"
 
-class dBgS_CaptPoly;
+struct dBgS_CaptPoly;
 
 typedef void (*CaptPolyCallback)(dBgS_CaptPoly&, cBgD_Vtx_t*, u16, u16, u16, cM3dGPla*);
 

include/d/d_bg_w.h

@@ -14,7 +14,7 @@ class cBgS_GrpPassChk;
 class cBgS_PolyPassChk;
 class fopAc_ac_c;
 struct cBgD_Vtx_t;
-class dBgS_CaptPoly;
+struct dBgS_CaptPoly;
 
 class cBgW_TriElm {
 public:

include/d/d_bg_w_base.h

@@ -11,7 +11,7 @@ class cBgS_GndChk;
 class cBgS_LinChk;
 class cBgS_ShdwDraw;
 class dBgS_Acch;
-class dBgS_CaptPoly;
+struct dBgS_CaptPoly;
 class dBgS_RoofChk;
 class dBgS_SphChk;
 class dBgS_SplGrpChk;

include/d/d_bg_w_kcol.h

@@ -10,7 +10,7 @@
 class cBgS_GrpPassChk;
 class cBgS_PolyPassChk;
 class dBgPc;
-class dBgS_CaptPoly;
+struct dBgS_CaptPoly;
 
 struct KC_PrismData {
     /* 0x0 */ f32 height;