Remove extra semicolons from C++ code.

Clang based tools running over the code complain about these,
but clang has a fixit for removing them.

Source/cmFunctionCommand.cxx

@@ -20,7 +20,7 @@ public:
   cmFunctionHelperCommand() {}
 
   ///! clean up any memory allocated by the function
-  ~cmFunctionHelperCommand() {};
+  ~cmFunctionHelperCommand() {}
 
   /**
    * This is used to avoid including this command
@@ -59,7 +59,7 @@ public:
                                  cmExecutionStatus &);
 
   virtual bool InitialPass(std::vector<std::string> const&,
-                           cmExecutionStatus &) { return false; };
+                           cmExecutionStatus &) { return false; }
 
   /**
    * The name of the command as specified in CMakeList.txt.