x86-32: Don't set ignore_fpu_irq in simd exception

Any processor that supports simd will have an internal fpu, and the
irq13 handler will not be enabled.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1269176446-2489-5-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>