qt: Revert "Force TLS1.0+ for SSL connections"

fix for upstream bitcoin qt5 openssl issue: https://github.com/bitcoin/bitcoin/pull/14403

src/qt/bitcoin.cpp

@@ -50,7 +50,6 @@
 #include <QThread>
 #include <QTimer>
 #include <QTranslator>
-#include <QSslConfiguration>
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
@@ -573,13 +572,6 @@ int main(int argc, char *argv[])
 #ifdef Q_OS_MAC
     QApplication::setAttribute(Qt::AA_DontShowIconsInMenus);
 #endif
-#if QT_VERSION >= 0x050500
-    // Because of the POODLE attack it is recommended to disable SSLv3 (https://disablessl3.com/),
-    // so set SSL protocols to TLS1.0+.
-    QSslConfiguration sslconf = QSslConfiguration::defaultConfiguration();
-    sslconf.setProtocol(QSsl::TlsV1_0OrLater);
-    QSslConfiguration::setDefaultConfiguration(sslconf);
-#endif
 
     // Register meta types used for QMetaObject::invokeMethod
     qRegisterMetaType< bool* >();