Use insert instead of a loop in some cases.

Limit this change to inserting into a vector from a vector.

A follow up change can use insert for inserting into a set.

Source/cmRemoveCommand.cxx

@@ -39,10 +39,7 @@ bool cmRemoveCommand
   // check for REMOVE(VAR v1 v2 ... vn)
   std::vector<std::string> argsExpanded;
   std::vector<std::string> temp;
-  for(unsigned int j = 1; j < args.size(); ++j)
-    {
-    temp.push_back(args[j]);
-    }
+  temp.insert(temp.end(), args.begin() + 1, args.end());
   cmSystemTools::ExpandList(temp, argsExpanded);
 
   // now create the new value