Disable MiNT thread usage and use hw access for updating DMA audio pointers

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402074

src/audio/mint/SDL_mintaudio_xbios.c

@@ -82,7 +82,8 @@ static int Audio_Available(void)
 	unsigned long dummy;
 	const char *envr = SDL_getenv("SDL_AUDIODRIVER");
 
-	SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
+	/*SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);*/
+	SDL_MintAudio_mint_present = SDL_FALSE;
 
 	/* We can't use XBIOS in interrupt with Magic, don't know about thread */
 	if (Getcookie(C_MagX, &dummy) == C_FOUND) {
@@ -437,7 +438,8 @@ static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 	} else {
 		/* Install interrupt */
 		Jdisint(MFP_DMASOUND);
-		Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
+		/*Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);*/
+		Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
 		Jenabint(MFP_DMASOUND);
 
 		if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {