Don't forward declare types form openssl in public headers

There's no real reason for the typedef here, QtNetwork
will compile without it and it might conflict with
openssl.

Change-Id: Id352ccc98d84ca9ee9ea3c7b4a942382882173f1
Reviewed-by: Peter Hartmann <peter.hartmann@nokia.com>
Reviewed-by: Richard J. Moore <rich@kde.org>

src/network/ssl/qsslcertificate.h

@@ -52,8 +52,6 @@
 #include <QtCore/qmap.h>
 #include <QtNetwork/qssl.h>
 
-typedef struct x509_st X509; // ### check if this works
-
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE