Fix buildings removal (#3319)

Author: tederis

Client/game_sa/CWorldSA.cpp

@@ -1069,7 +1069,7 @@ bool CWorldSA::IsRemovedModelInRadius(SIPLInst* pInst)
 
             float fDistance = sqrt(fDistanceX * fDistanceX + fDistanceY * fDistanceY + fDistanceZ * fDistanceZ);
             // is it in the removal spheres radius if so return else keep looking
-            if (fDistance <= pFind->m_fRadius && (pFind->m_cInterior == -1 || pFind->m_cInterior == pInst->m_nInterior))
+            if (fDistance <= pFind->m_fRadius && (pFind->m_cInterior == -1 || pFind->m_cInterior == pInst->m_nAreaCode))
             {
                 return true;
             }

Client/sdk/game/CWorld.h

@@ -95,15 +95,27 @@ struct SBuildingRemoval
     std::list<CEntitySAInterface*>* m_pBinaryRemoveList;
     std::list<CEntitySAInterface*>* m_pDataRemoveList;
 };
+
 struct SIPLInst
 {
-    CVector m_pPosition;
-    CVector m_pRotation;
-    float   m_fRotationCont;
-    WORD    m_nModelIndex;
-    BYTE    m_nInterior;
-    BYTE    m_bLOD;
+    CVector     m_pPosition;
+    CVector4D   m_pRotation;
+    int32_t     m_nModelIndex;
+    union {
+        struct {
+            uint32_t m_nAreaCode : 8;
+            uint32_t m_bRedundantStream : 1;
+            uint32_t m_bDontStream : 1;
+            uint32_t m_bUnderwater : 1;
+            uint32_t m_bTunnel : 1;
+            uint32_t m_bTunnelTransition : 1;
+            uint32_t m_nReserved : 19;
+        };
+        uint32_t m_nInstanceType;
+    };
+    int32_t m_nLodInstanceIndex;
 };
+static_assert(sizeof(SIPLInst) == 0x28, "Invalid sizeof(SIPLInst)");
 
 struct sDataBuildingRemovalItem
 {