Replace lrint(x) with static_cast(x+0.5)

Update 9 files

Update RageSoundReader_Extend.cpp
Update RageSoundReader_Preload.cpp
Update RageSoundUtil.cpp
Update RageSoundReader_ThreadedBuffer.cpp
Update RageSoundReader_SpeedChange.cpp
Update RageSoundReader_Resample_Good.cpp
Update RageSoundReader_Merge.cpp
Update RageSoundReader_Chain.cpp
Update RageSoundMixBuffer.cpp

src/RageSoundReader_ThreadedBuffer.cpp

@@ -237,7 +237,7 @@ void RageSoundReader_ThreadedBuffer::BufferingThread()
 		else
 		{
 			m_Event.Unlock();
-			usleep( std::lrint(fTimeToSleep * 1000000) );
+			usleep( static_cast<int>((fTimeToSleep * 1000000) + 0.5) );
 			m_Event.Lock();
 		}
 	}