Frame interp: Fix Epona's reins

include/d/actor/d_a_horse.h

@@ -196,6 +196,9 @@ public:
     void copyReinPos();
     void setReinPosHandSubstance(int);
     void setReinPosNormalSubstance();
+#if TARGET_PC
+    void lerpControlPoints(f32 alpha);
+#endif
     void bgCheck();
     bool checkSpecialWallHitSubstance(cXyz const&) const;
     void setServiceWaitTimer();

include/d/d_drawlist.h

@@ -435,6 +435,10 @@ public:
         m3DLineMatSortPacket[param_1->getMaterialID()].setMatDark(param_1);
     }
 
+#if TARGET_PC
+    void refresh3DlineMats(const cXyz& eye);
+#endif
+
     void peekZdata() { mPeekZ.peekData(); }
     void entryZSortListZxlu(J3DPacket* i_packet, cXyz& param_1) {
         entryZSortXluDrawList(mDrawBuffers[DB_LIST_Z_XLU], i_packet, param_1);