clang-tidy: add explicit deleted constructors

Found with cppcoreguidelines-special-member-functions

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

src/output/plugins/AlsaOutputPlugin.cxx

@@ -226,6 +226,9 @@ public:
 		snd_config_update_free_global();
 	}
 
+	AlsaOutput(const AlsaOutput &) = delete;
+	AlsaOutput &operator=(const AlsaOutput &) = delete;
+
 	using MultiSocketMonitor::GetEventLoop;
 
 	gcc_pure

src/output/plugins/AoOutputPlugin.cxx

@@ -42,6 +42,9 @@ public:
 	~AoInit() noexcept {
 		ao_shutdown();
 	}
+
+	AoInit(const AoInit &) = delete;
+	AoInit &operator=(const AoInit &) = delete;
 };
 
 class AoOutput final : AudioOutput, SafeSingleton<AoInit> {
@@ -55,6 +58,9 @@ class AoOutput final : AudioOutput, SafeSingleton<AoInit> {
 	explicit AoOutput(const ConfigBlock &block);
 	~AoOutput() override;
 
+	AoOutput(const AoOutput &) = delete;
+	AoOutput &operator=(const AoOutput &) = delete;
+
 public:
 	static AudioOutput *Create(EventLoop &, const ConfigBlock &block) {
 		return new AoOutput(block);

src/output/plugins/FifoOutputPlugin.cxx

@@ -49,6 +49,9 @@ public:
 		CloseFifo();
 	}
 
+	FifoOutput(const FifoOutput &) = delete;
+	FifoOutput &operator=(const FifoOutput &) = delete;
+
 	static AudioOutput *Create(EventLoop &,
 				   const ConfigBlock &block) {
 		return new FifoOutput(block);

src/output/plugins/ShoutOutputPlugin.cxx

@@ -51,6 +51,9 @@ struct ShoutOutput final : AudioOutput {
 	explicit ShoutOutput(const ConfigBlock &block);
 	~ShoutOutput() override;
 
+	ShoutOutput(const ShoutOutput &) = delete;
+	ShoutOutput &operator=(const ShoutOutput &) = delete;
+
 	static AudioOutput *Create(EventLoop &event_loop,
 				   const ConfigBlock &block);