Qt5 build errors using OpenSSL-1.1.0-pre[n]

Hi, everyone,

Got errors while building QT5 with recent OpenSSL-1.1.0-dev:

• MinGW-W64:
  error: invalid use of incomplete type 'X509 {aka struct x509_st}

  return qHashBits(x509->sha1_hash, SHA_DIGEST_LENGTH, seed);

• Intel C++ Compiler:
  error: pointer to incomplete class type is not allowed
  return qHashBits(x509->sha1_hash, SHA_DIGEST_LENGTH, seed);

• MSVC:
  error C2027: use of undefined type 'x509_st'

(logs added in attachment).

The source of errors are recent changes in OpenSSL API, struct x509_st a.k.a X509 has been made opaque.

Regards,

Alexander