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pc kernel: fix wrong simd exception mask (fixes go bootstrap)

--- a/sys/src/9/pc/main.c

+++ b/sys/src/9/pc/main.c

@@ -527,7 +527,7 @@

 	case FPinit:

 		fpinit();

 		if(fpsave == fpssesave)

-			ldmxcsr(0);	/* no simd exceptions on 386 */

+			ldmxcsr(0x1f80);	/* no simd exceptions on 386 */

 		while(up->fpsave == nil)

 			up->fpsave = mallocalign(sizeof(FPsave), FPalign, 0, 0);

 		up->fpstate = FPactive;