fix: missing override specifier

Author: scc-tw

include/retdec/llvmir2hll/hll/hll_writers/c_hll_writer.h

@@ -135,7 +135,7 @@ class CHLLWriter: public HLLWriter {
 	/// @}
 
 	bool shouldEmitFunctionPrototypesHeader() const;
-	bool emitFunctionPrototypes(const FuncSet &funcs);
+	bool emitFunctionPrototypes(const FuncSet& funcs) override;
 	bool emitStandardFunctionPrototypes();
 	bool emitFunctionPrototypesForNonLibraryFuncs();
 	bool emitFunctionPrototype(ShPtr<Function> func);