Bump required Qt version to 5.12

src/internet/localredirectserver.cpp

@@ -46,9 +46,7 @@
 #include <QTcpSocket>
 #include <QSslSocket>
 #include <QDateTime>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-#  include <QRandomGenerator>
-#endif
+#include <QRandomGenerator>
 
 LocalRedirectServer::LocalRedirectServer(QObject *parent)
     : QTcpServer(parent),
@@ -152,11 +150,7 @@ bool LocalRedirectServer::GenerateCertificate() {
     return false;
   }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-  quint64 serial = 9999999 + QRandomGenerator::global()->bounded(1000000);
-#else
-  quint64 serial = (9999999 + qrand() % 1000000);
-#endif
+  const quint64 serial = 9999999 + QRandomGenerator::global()->bounded(1000000);
 
   QByteArray q_serial;
   q_serial.setNum(serial);