Fix unused parameter compiler warnings

src/mathic/Action.cpp

@@ -9,6 +9,8 @@ namespace mathic {
     std::vector<std::string> tokens,
     CliParser& parser
   ) {
+    (void)parser;
+
     if (!tokens.empty()) {
       reportError("Expected a dash (-) to indicate an option when reading \"" +
         tokens.front() + "\".");

src/mathic/DivMask.h

@@ -386,7 +386,11 @@ namespace mathic {
   public:
     void resetDivMask() {MATHIC_ASSERT(false);}
     DivMask getDivMask() const {MATHIC_ASSERT(false); return DivMask();}
-    bool canDivide(const HasDivMask<false>& t) const {return true;}
+    bool canDivide(const HasDivMask<false>& t) const
+    {
+      (void)t;
+      return true;
+    }
     template<bool B>
     void updateToLowerBound(const HasDivMask<B>& entry) {}
   };

src/mathic/HelpAction.cpp

@@ -39,6 +39,7 @@ namespace mathic {
   }
 
   void HelpAction::pushBackParameters(std::vector<CliParameter*>& parameters) {
+    (void)parameters;
   }
 
   namespace {

src/mathic/PairQueue.h

@@ -181,10 +181,12 @@ namespace mathic {
 	  void undoAdd() {}
 
 	  void retireIndex(size_t index) {
+		(void)index;
 		MATHIC_ASSERT(false); // this method should not be called.
 	  }
 
 	  bool retired(size_t index) const {
+		(void)index;
 		return false;
 	  }
 	};