clang-tidy: add explicit deleted constructors

Found with cppcoreguidelines-special-member-functions

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/encoder/plugins/FlacEncoderPlugin.cxx

@@ -54,6 +54,9 @@ public:
 		FLAC__stream_encoder_delete(fse);
 	}
 
+	FlacEncoder(const FlacEncoder &) = delete;
+	FlacEncoder &operator=(const FlacEncoder &) = delete;
+
 	/* virtual methods from class Encoder */
 	void End() override {
 		(void) FLAC__stream_encoder_finish(fse);

src/encoder/plugins/LameEncoderPlugin.cxx

@@ -47,6 +47,9 @@ public:
 
 	~LameEncoder() noexcept override;
 
+	LameEncoder(const LameEncoder &) = delete;
+	LameEncoder &operator=(const LameEncoder &) = delete;
+
 	/* virtual methods from class Encoder */
 	void Write(const void *data, size_t length) override;
 	size_t Read(void *dest, size_t length) noexcept override;

src/encoder/plugins/OpusEncoderPlugin.cxx

@@ -56,6 +56,9 @@ public:
 	OpusEncoder(AudioFormat &_audio_format, ::OpusEncoder *_enc, bool _chaining);
 	~OpusEncoder() noexcept override;
 
+	OpusEncoder(const OpusEncoder &) = delete;
+	OpusEncoder &operator=(const OpusEncoder &) = delete;
+
 	/* virtual methods from class Encoder */
 	void End() override;
 	void Write(const void *data, size_t length) override;

src/encoder/plugins/TwolameEncoderPlugin.cxx

@@ -54,6 +54,9 @@ public:
 		 audio_format(_audio_format), options(_options) {}
 	~TwolameEncoder() noexcept override;
 
+	TwolameEncoder(const TwolameEncoder &) = delete;
+	TwolameEncoder &operator=(const TwolameEncoder &) = delete;
+
 	/* virtual methods from class Encoder */
 
 	void End() override {

src/encoder/plugins/VorbisEncoderPlugin.cxx

@@ -44,6 +44,9 @@ public:
 		vorbis_info_clear(&vi);
 	}
 
+	VorbisEncoder(const VorbisEncoder &) = delete;
+	VorbisEncoder &operator=(const VorbisEncoder &) = delete;
+
 	/* virtual methods from class Encoder */
 	void End() override {
 		PreTag();