clang-tidy cleanups. No functional change intended.

src/V3ParseLex.cpp

@@ -37,7 +37,7 @@ public:
     // CONSTRUCTORS
     V3Lexer()
         : V3LexerBase{nullptr} {}
-    ~V3Lexer() {}
+    ~V3Lexer() override {}
     // METHODS
     void unputString(const char* textp, size_t length) {
         // Add characters to input stream in back-to-front order