vm86: set IOPL to 3 on pushf

Hi.

The attached patch fixes the pushf under v86
to always set the IOPL field to 3, as the
Intel CPUs do.
It was in 2.4 for year, but somehow missed
2.6. It comes from here (although now a bit
shorter):
http://lkml.org/lkml/2003/5/25/81

Andrew, could you please apply this to 2.6?

@@ -394,6 +394,7 @@
 
 	if (VEFLAGS & VIF_MASK)
 		flags |= IF_MASK;
+	flags |= IOPL_MASK;
 	return flags | (VEFLAGS & current->thread.v86mask);
 }
 

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