frame interp: fix obj_klift00 chains

include/d/actor/d_a_obj_klift00.h

@@ -25,6 +25,10 @@ public:
     int Draw();
     int Delete();
 
+#if TARGET_PC
+    void onInterpCallback();
+#endif
+
     enum Param_e {
         LOCK_e = (1 << 6), NO_BASE_DISP = (1 << 7)
     };
@@ -50,6 +54,13 @@ private:
     /* 0x1020 */ dCcD_Cyl mCylinderCollider;
     /* 0x115C */ s32 mStopSwingingFrames;
 
+#if TARGET_PC
+    cXyz mChainInterpPrev[64];
+    cXyz mChainInterpCurr[64];
+    bool mChainInterpPrevValid;
+    bool mChainInterpCurrValid;
+#endif
+
     // Number of chain models
     u32 getArg0() {
         return fopAcM_GetParamBit(this, 0, 6);