cleanup w->a cross calls in crypt

[James Hawkins]

Hi,

I have checked this patch over and over, but I would appreciate it
if you guys could make sure it is ready to be committed.  I tried to
break up the changes into as many patches as I could, but these last
few functions depend on CRYPT_GetProvKeyName and CRYPT_GetTypeKeyName
which had to be unicodified as well.  The tests for these functions
will be sent in the next patch.