crypto/err/err_all.c: load SM2 error strings

crypto/err/err_all.c: load SM2 error strings

The function ossl_err_load_SM2_strings() exists, but wasn't called
in ossl_err_load_crypto_strings().  Rescind this omission.

Fixes: 3d328a445c2a "Add SM2 signature and ECIES schemes"
Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.foundation>
MergeDate: Fri Apr  3 15:32:47 2026
(Merged from https://github.com/openssl/openssl/pull/30625)