When running in pic mode we don't have enough general registers for all

the xcrypt inputs, hence the dance which is done to make this work.

The constraint for the key however was "mr" which is both from
memory and from a general register, it seems gcc3 went with the former
and gcc4 went with the later in the pic case, so change the
constraint for the key to just "m" which gives us more efficient
code that both gcc3 and gcc4 are happy with.

ok kettenis@

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