Revert Amber-MD#1159

Author: Daniel R. Roe

src/Energy/Ene_LJ_6_12.h

@@ -14,21 +14,6 @@ T Ene_LJ_6_12(T const& rij2, T const& LJA, T const& LJB)
   T e_vdw = f12 - f6;   // (A/r^12)-(B/r^6)
   return e_vdw;
 }
-
-/// \return LJ 12-6-4 energy
-template <typename T>
-T Ene_LJ_12_6_4(T const& rij2, T const& LJA, T const& LJB, T const& LJC)
-{
-  T r2    = 1.0 / rij2;
-  T r4    = r2  * r2;
-  T r6    = r4  * r2;
-  T r12   = r6  * r6;
-  T f12   = LJA * r12;  // A/r^12
-  T f6    = LJB * r6;   // B/r^6
-  T f4    = LJC * r4;   // C/r^4
-  T e_vdw = f12 - f6 - f4; // (A/r^12)-(B/r^6)-(C/r^4)
-  return e_vdw;
-}
 }
 }
 #endif