hashcash-1.20 release

Hi

I just released hashcash-1.20.  If you're using fedora core 4 like me,
this fixes an rpm dependency issue, making it more fc4 friendly.

It also fixes a minor bug that made the -w option report the size of a
stamp.  The bug was the code used the version 0 algorithm instead of
the version 1 algorithm for version 1 stamps.

(version 0 gives the sender the benefit of any luck in getting eg
21-bits when aiming for 20-bits, with version 1 the target number of
bits is part of the stamp, and the stamp is not considered worth more
than that value even if the collision is larger).

Also this release includes a number of fixes relating to fc4 to remove
compile warnings.

And more aggressive building of mmx code to take advantage of that in
more builds.  (rpm always built mmx code, but some of the makefile
variants were not).

	http://www.hashcash.org/tool/

If someone has a non-mmx intel x86 CPU handy, you can tell me if it
still runs on it.  (It should.)

Adam