sm: Add support to export ECC private keys.
* sm/minip12.c [TEST]: Remove test code. Include util.h, tlv.h. and openpgpdefs.h. Remove the class and tag constants and replace them by those from tlv.h. (builder_add_oid, builder_add_mpi): New. (build_key_sequence): Rename to ... (build_rsa_key_sequence): this. (build_ecc_key_sequence): New. (p12_build): Call RSA or ECC builder. (p12_raw_build): Ditto. * sm/export.c (gpgsm_p12_export): Use correct armor header for ECC. (sexp_to_kparms): Support ECC. * sm/t-minip12.c: New to replace the former TEST code in minip12.h.
- GnuPG-bug-id: T4921