SM2 signatures work correctly only with SM3 digests

Reviewed-by: NPaul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15074)

test/recipes/30-test_evp_data/evppkey_sm2.txt

@@ -39,6 +39,7 @@ Verify = SM2_key1
 Ctrl = digest:SHA512
 Input = 40AA1B203C9D8EE150B21C3C7CDA8261492E5420C5F2B9F7380700E094C303B48E62F319C1DA0E32EB40D113C5F1749CC61AEB499167890AB82F2CC9BB706971
 Output = 3046022100AE018933B9BA041784380069F2DDF609694DCD299FDBF23D09F4B711FBC103EC0221008440BB1A48C132DE4FB91BE9F43B958142FDD29FB9DABE01B17514023A2F638C
+Result = PKEY_CTRL_ERROR
 
 Availablein = default
 Decrypt = SM2_key1