Move cBgS_GrpPassChk and cBgS_PolyPassChk to separate headers (#2861)

This is supported by RTTI ordering which only makes sense if these
classes are in separate headers from the dBgS_* classes.

include/SSystem/SComponent/c_bg_s_chk.h

@@ -3,16 +3,11 @@
 
 #include "dolphin/mtx.h"
 #include "f_pc/f_pc_base.h"
+#include "SSystem/SComponent/c_bg_s_grp_pass_chk.h"
+#include "SSystem/SComponent/c_bg_s_poly_pass_chk.h"
 
 struct cBgD_Vtx_t : public Vec {};
 
-class cBgS_GrpPassChk {
-public:
-    virtual ~cBgS_GrpPassChk() {}
-};
-
-class cBgS_PolyPassChk;
-
 class cBgS_Chk {
 public:
     /* 0x0 */ cBgS_PolyPassChk* mPolyPassChk;

include/SSystem/SComponent/c_bg_s_grp_pass_chk.h

@@ -0,0 +1,9 @@
+#ifndef C_BG_S_GRP_PASS_CHK_H
+#define C_BG_S_GRP_PASS_CHK_H
+
+class cBgS_GrpPassChk {
+public:
+    virtual ~cBgS_GrpPassChk() {}
+};
+
+#endif /* C_BG_S_GRP_PASS_CHK_H */

include/SSystem/SComponent/c_bg_s_poly_pass_chk.h

@@ -0,0 +1,9 @@
+#ifndef C_BG_S_POLY_PASS_CHK_H
+#define C_BG_S_POLY_PASS_CHK_H
+
+class cBgS_PolyPassChk {
+public:
+    virtual ~cBgS_PolyPassChk() {}
+};
+
+#endif /* C_BG_S_POLY_PASS_CHK_H */