clang-tidy: Use override keyword

run-clang-tidy -header-filter='.*' -checks='-*,modernize-use-override' -fix

taglib/mpc/mpcfile.h

@@ -107,42 +107,42 @@ namespace TagLib {
       /*!
        * Destroys this instance of the File.
        */
-      virtual ~File();
+      ~File() override;
 
       /*!
        * Returns the Tag for this file.  This will be an APE tag, an ID3v1 tag
        * or a combination of the two.
        */
-      virtual TagLib::Tag *tag() const;
+      TagLib::Tag *tag() const override;
 
       /*!
        * Implements the unified property interface -- export function.
        * If the file contains both an APE and an ID3v1 tag, only the APE
        * tag  will be converted to the PropertyMap.
        */
-      PropertyMap properties() const;
+      PropertyMap properties() const override;
 
-      void removeUnsupportedProperties(const StringList &properties);
+      void removeUnsupportedProperties(const StringList &properties) override;
 
       /*!
        * Implements the unified property interface -- import function.
        * Affects only the APEv2 tag which will be created if necessary.
        * If an ID3v1 tag exists, it will be updated as well.
        */
-      PropertyMap setProperties(const PropertyMap &);
+      PropertyMap setProperties(const PropertyMap &) override;
 
       /*!
        * Returns the MPC::Properties for this file.  If no audio properties
        * were read then this will return a null pointer.
        */
-      virtual Properties *audioProperties() const;
+      Properties *audioProperties() const override;
 
       /*!
        * Saves the file.
        *
        * This returns true if the save was successful.
        */
-      virtual bool save();
+      bool save() override;
 
       /*!
        * Returns a pointer to the ID3v1 tag of the file.

taglib/mpc/mpcproperties.h

@@ -57,29 +57,29 @@ namespace TagLib {
       /*!
        * Destroys this MPC::Properties instance.
        */
-      virtual ~Properties();
+      ~Properties() override;
 
       /*!
        * Returns the length of the file in milliseconds.
        *
        * \see lengthInSeconds()
        */
-      virtual int lengthInMilliseconds() const;
+      int lengthInMilliseconds() const override;
 
       /*!
        * Returns the average bit rate of the file in kb/s.
        */
-      virtual int bitrate() const;
+      int bitrate() const override;
 
       /*!
        * Returns the sample rate in Hz.
        */
-      virtual int sampleRate() const;
+      int sampleRate() const override;
 
       /*!
        * Returns the number of audio channels.
        */
-      virtual int channels() const;
+      int channels() const override;
 
       /*!
        * Returns the version of the bitstream (SV4-SV8)