RC4 compatibility testing

[Nathan Loofbourrow]

Eric Rescorla writes:
 > I note that this is the algorithm _without_ Hal Finney's
 > proposed modification
 > 
 > (see <199409130605.XAA24133 at jobe.shell.portal.com>).

Hal Finney's patch makes syntactic sense, but won't affect the results
of the algorithm. Therefore, Eric's test suite holds for both versions.

nathan