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/cmStringCommand.h

@@ -83,7 +83,7 @@ protected:
     RegexReplacement(const char* s): number(-1), value(s) {}
     RegexReplacement(const std::string& s): number(-1), value(s) {}
     RegexReplacement(int n): number(n), value() {}
-    RegexReplacement() {};
+    RegexReplacement() {}
     int number;
     std::string value;
   };