remove dead code and fix compilation for fix mscg

src/MSCG/fix_mscg.cpp

@@ -21,6 +21,7 @@
 #include "fix_mscg.h"
 #include "mscg.h"
 #include "atom.h"
+#include "comm.h"
 #include "domain.h"
 #include "error.h"
 #include "force.h"
@@ -284,11 +285,9 @@ void FixMSCG::end_of_step()
   if (domain->triclinic == 1)
     error->all(FLERR,"Fix mscg does not yet support triclinic geometries");
 
-  int natoms = atom->natoms;
   int nlocal = atom->nlocal;
   tagint *tag = atom->tag;
   double **x = atom->x;
-  double *prd_half = domain->prd_half;
   int i,ii,j;
 
   // trajectory information

src/USER-INTEL/dihedral_opls_intel.cpp

@@ -185,13 +185,6 @@ void DihedralOPLSIntel::eval(const int vflag,
       const flt_t vb3y = x[i4].y - x[i3].y;
       const flt_t vb3z = x[i4].z - x[i3].z;
 
-      // 1-4
-
-      const flt_t delx = x[i1].x - x[i4].x;
-      const flt_t dely = x[i1].y - x[i4].y;
-      const flt_t delz = x[i1].z - x[i4].z;
-
-
       // c0 calculation
       // 1st and 2nd angle