Fix losing audio while loading a save state

This fixes the losing audio after loading a save state issue with
certain plugins in certain games. I was hesitant to submit this, since
the fault is the audio plugin itself, but this also fixes bad save
states. This will not fix games like Top Gear Rally.

Any plugin that initially had this problem, can still lose audio at any
given time, due to flaws in the audio plugin itself. It is best to
simply use a plugin that doesn't have this issue to begin with, for such
games.

Source/Project64/N64 System/N64 Class.cpp

@@ -1726,6 +1726,10 @@ bool CN64System::LoadState(LPCSTR FileName)
 		CloseHandle(hSaveFile);
 	}
 	
+	//Fix losing audio in certain games with certain plugins
+	m_Reg.m_AudioIntrReg |= MI_INTR_AI;
+	m_Reg.AI_STATUS_REG &= ~AI_STATUS_FIFO_FULL;
+	
 	//Fix Random Register
 	while ((int)m_Reg.RANDOM_REGISTER < (int)m_Reg.WIRED_REGISTER)
     {