make get_cipher_handle static

Reviewed-by: NPaul Dale <paul.dale@oracle.com>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4717)

engines/e_afalg.c

@@ -80,7 +80,7 @@ static int afalg_destroy(ENGINE *e);
 static int afalg_init(ENGINE *e);
 static int afalg_finish(ENGINE *e);
 const EVP_CIPHER *afalg_aes_cbc(int nid);
-cbc_handles *get_cipher_handle(int nid);
+static cbc_handles *get_cipher_handle(int nid);
 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
                          const int **nids, int nid);
 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,