use explicit scoping in destructor

src/REAXFF/fix_acks2_reaxff.cpp

@@ -94,8 +94,8 @@ FixACKS2ReaxFF::~FixACKS2ReaxFF()
   memory->destroy(s_hist_X);
   memory->destroy(s_hist_last);
 
-  deallocate_storage();
-  deallocate_matrix();
+  FixACKS2ReaxFF::deallocate_storage();
+  FixACKS2ReaxFF::deallocate_matrix();
 }
 
 /* ---------------------------------------------------------------------- */

src/REAXFF/fix_qeq_reaxff.cpp

@@ -163,7 +163,7 @@ FixQEqReaxFF::~FixQEqReaxFF()
   memory->destroy(t_hist);
 
   FixQEqReaxFF::deallocate_storage();
-  deallocate_matrix();
+  FixQEqReaxFF::deallocate_matrix();
 
   memory->destroy(shld);