Remove non-existant functions from libcrypto.num

These were never made public so can just be deleted.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6386)

util/libcrypto.num

@@ -4514,16 +4514,6 @@ EVP_PKEY_new_CMAC_key                   4455	1_1_1	EXIST::FUNCTION:
 EVP_PKEY_asn1_set_set_priv_key          4456	1_1_1	EXIST::FUNCTION:
 EVP_PKEY_asn1_set_set_pub_key           4457	1_1_1	EXIST::FUNCTION:
 RAND_DRBG_set_defaults                  4458	1_1_1	EXIST::FUNCTION:
-SM2_decrypt                             4459	1_1_1	EXIST::FUNCTION:SM2
-SM2_do_sign                             4460	1_1_1	EXIST::FUNCTION:SM2
-SM2_compute_userid_digest               4461	1_1_1	EXIST::FUNCTION:SM2
-SM2_encrypt                             4462	1_1_1	EXIST::FUNCTION:SM2
-SM2_ciphertext_size                     4463	1_1_1	EXIST::FUNCTION:SM2
-SM2_verify                              4464	1_1_1	EXIST::FUNCTION:SM2
-SM2_do_verify                           4465	1_1_1	EXIST::FUNCTION:SM2
-SM2_sign                                4466	1_1_1	EXIST::FUNCTION:SM2
-ERR_load_SM2_strings                    4467	1_1_1	EXIST::FUNCTION:SM2
-SM2_plaintext_size                      4468	1_1_1	EXIST::FUNCTION:SM2
 conf_ssl_name_find                      4469	1_1_0i	EXIST::FUNCTION:
 conf_ssl_get_cmd                        4470	1_1_0i	EXIST::FUNCTION:
 conf_ssl_get                            4471	1_1_0i	EXIST::FUNCTION: