Fix assembler for Alpha (tested only on DEC OSF not Linux or *BSD). The

Fix assembler for Alpha (tested only on DEC OSF not Linux or *BSD).  The
problem was that one of the replacement routines had not been working since
SSLeay releases.  For now the offending routine has been replaced with
non-optimised assembler.  Even so, this now gives around 95% performance
improvement for 1024 bit RSA signs.