openssl pkcs12: remove support for LMK and CSP attributes

openssl pkcs12: remove support for LMK and CSP attributes

Documentation on what the Microsoft-specific local machine keyset and the
cryptographic service provider are actually good for is hard to find. For
some reason (perhaps one million and two arguments for PKCS12_create() was
considered two too many) these hang off the EVP_PKEY in the attributes
member, which serves no other purpose.

Every use of EVP_PKEY (of which there are far too many) pays extra memory
taxes for this fringe use case. This complication is not worth it.

ok miod