openssl: Remove unused openssl_hash_chunk() helper

Was used by the ECDSA implementation before 293a912c7d ("openssl: Fixes
for ECDSA with OpenSSL 3.0").

src/libstrongswan/plugins/openssl/openssl_util.h

@@ -57,18 +57,6 @@ bool openssl_compute_shared_key(EVP_PKEY *priv, EVP_PKEY *pub, chunk_t *shared);
  */
 bool openssl_fingerprint(EVP_PKEY *key, cred_encoding_type_t type, chunk_t *fp);
 
-/**
- * Creates a hash of a given type of a chunk of data.
- *
- * Note: this function allocates memory for the hash
- *
- * @param hash_type	NID of the hash
- * @param data		the chunk of data to hash
- * @param hash		chunk that contains the hash
- * @return			TRUE on success, FALSE otherwise
- */
-bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash);
-
 /**
  * Concatenates two bignums into a chunk, thereby enforcing the length of
  * a single BIGNUM, if necessary, by pre-pending it with zeros.