Bug 586163: Document the change to PKCS #12 nickname collision callback in NSS 3.12 by renaming the 'wincx' argument to 'leafCert'.  Also remove several unused 'wincx' arguments.  r=nelson.
Bug 586163: Document the change to PKCS #12 nickname collision callback in
NSS 3.12 by renaming the 'wincx' argument to 'leafCert'.  Also remove
several unused 'wincx' arguments.  r=nelson.

thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss