Revert of Removing #defines previously used for building without BoringSSL/OpenSSL.

webrtc/base/openssldigest.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#if HAVE_OPENSSL_SSL_H
+
 #include "webrtc/base/openssldigest.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/common.h"
 #include "webrtc/base/openssl.h"
 
 namespace rtc {
 
 OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
   EVP_MD_CTX_init(&ctx_);
@@ skipping 88 matching lines @@
                                   size_t* length) {
   const EVP_MD *md;
   if (!GetDigestEVP(algorithm, &md))
     return false;
 
   *length = EVP_MD_size(md);
   return true;
 }
 
 }  // namespace rtc
+
+#endif  // HAVE_OPENSSL_SSL_H