*: add lost of "noexcept" specifications

src/output/plugins/AlsaOutputPlugin.cxx

@@ -132,7 +132,7 @@ public:
 	}
 
 	gcc_pure
-	const char *GetDevice() {
+	const char *GetDevice() const noexcept {
 		return device.empty() ? default_device : device.c_str();
 	}
 

src/output/plugins/OpenALOutputPlugin.cxx

@@ -73,19 +73,19 @@ class OpenALOutput {
 
 private:
 	gcc_pure
-	ALint GetSourceI(ALenum param) const {
+	ALint GetSourceI(ALenum param) const noexcept {
 		ALint value;
 		alGetSourcei(source, param, &value);
 		return value;
 	}
 
 	gcc_pure
-	bool HasProcessed() const {
+	bool HasProcessed() const noexcept {
 		return GetSourceI(AL_BUFFERS_PROCESSED) > 0;
 	}
 
 	gcc_pure
-	bool IsPlaying() const {
+	bool IsPlaying() const noexcept {
 		return GetSourceI(AL_SOURCE_STATE) == AL_PLAYING;
 	}
 

src/output/plugins/RecorderOutputPlugin.cxx

@@ -97,7 +97,7 @@ class RecorderOutput {
 
 private:
 	gcc_pure
-	bool HasDynamicPath() const {
+	bool HasDynamicPath() const noexcept {
 		return !format_path.empty();
 	}
 

src/output/plugins/httpd/HttpdInternal.hxx

@@ -191,7 +191,7 @@ public:
 	 * Caller must lock the mutex.
 	 */
 	gcc_pure
-	bool HasClients() const {
+	bool HasClients() const noexcept {
 		return !clients.empty();
 	}
 
@@ -199,7 +199,7 @@ public:
 	 * Check whether there is at least one client.
 	 */
 	gcc_pure
-	bool LockHasClients() const {
+	bool LockHasClients() const noexcept {
 		const std::lock_guard<Mutex> protect(mutex);
 		return HasClients();
 	}