pk: Move s-exp creation for gcry_pk_decrypt to the modules.
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pk: Move s-exp creation for gcry_pk_decrypt to the modules.

* cipher/pubkey.c (sexp_to_enc): Remove RET_MODERN arg and merge it
into FLAGS.
(gcry_pk_decrypt): Move result s-exp building into the modules.
* src/cipher-proto.h (gcry_pk_decrypt_t): Add some args.
* cipher/ecc.c (ecc_decrypt_raw): Change to return an s-exp.
* cipher/elgamal.c (elg_decrypt): Ditto.
* cipher/rsa.c (rsa_decrypt): Ditto.
(rsa_blind, rsa_unblind): Merge into rsa_decrypt.  This saves several
extra MPI allocations.

The extra args added to gcry_pk_decrypt_t are a temporary solution
unti we move the input s-exp parsing also into the modules.