Remove dead code in crypto/pkcs7

Reviewed-by: NStephen Henson <steve@openssl.org>

crypto/pkcs7/pk7_dgst.c

-/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License").  You may not use
- * this file except in compliance with the License.  You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-#include <stdio.h>
-#include "internal/cryptlib.h"
-#include <openssl/evp.h>
-#include <openssl/objects.h>
-#include <openssl/x509.h>
-#include <openssl/pkcs7.h>

crypto/pkcs7/pk7_enc.c

-/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License").  You may not use
- * this file except in compliance with the License.  You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-#include <stdio.h>
-#include "internal/cryptlib.h"
-#include <openssl/evp.h>
-#include <openssl/objects.h>
-#include <openssl/x509.h>
-#include <openssl/pkcs7.h>
-
-PKCS7_in_bio(PKCS7 *p7, BIO *in);
-PKCS7_out_bio(PKCS7 *p7, BIO *out);
-
-PKCS7_add_signer(PKCS7 *p7, X509 *cert, EVP_PKEY *key);
-PKCS7_cipher(PKCS7 *p7, EVP_CIPHER *cipher);
-
-PKCS7_Init(PKCS7 *p7);
-PKCS7_Update(PKCS7 *p7);
-PKCS7_Finish(PKCS7 *p7);