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games/snes: BIT #imm does not set NZ flags

--- a/sys/src/games/snes/cpu.c

+++ b/sys/src/games/snes/cpu.c

@@ -857,7 +857,11 @@

 			rY &= 0xff;

 		nzx(rY);

 		return 2;

-	case 0x89: bit(imm(0)); return 2+cyc;

+	case 0x89:

+		rP &= ~FLAGZ;

+		if((imm(0) & rA) == 0)

+			rP |= FLAGZ;

+		return 2+cyc;

 	case 0x8A: setra(rX); return 2+cyc;

 	case 0x8B: push8(rDB >> 16); return 3;

 	case 0x8C: memwx816(abso(0, 0), rY); return 4+cyc;