Disable copy and move operations in QSslContext

The class has a custom destructor, we should handle the other special
member functions as well.

Found by an Axivion scan.

Pick-to: 6.5
Task-number: QTBUG-125026
Change-Id: I172aeb02d81a0f66ab724892d9f938a12f371ffa
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
(cherry picked from commit d8e86a93303244286881d732aa570cb551b230e9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/plugins/tls/openssl/qsslcontext_openssl_p.h

@@ -30,6 +30,7 @@ QT_BEGIN_NAMESPACE
 class QSslContext
 {
 public:
+    Q_DISABLE_COPY_MOVE(QSslContext)
 
     ~QSslContext();