Fix some issues of a clang-cl developer build

- qeasingcurve.cpp: Add a cast, fixing:
  qeasingcurve.cpp(1515,25): error: implicit conversion between pointer-to-function and pointer-to-object is a Microsoft extension [-Werror,-Wmicrosoft-cast]
- Disable copy and move of QMainWindowLayoutSeparatorHelper, fixing:
  qbasictimer.h(59,5): note: 'QBasicTimer' has been explicitly marked deprecated here
    QT_DEPRECATED_X("copy-construction is unsupported; use move-construction instead")

Task-number: QTBUG-63512
Change-Id: I4d12a29cb1dcd68da9f9316c9e42992f218e6045
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: André de la Rocha <andre.rocha@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

src/corelib/tools/qeasingcurve.cpp

@@ -1512,7 +1512,7 @@ QDebug operator<<(QDebug debug, const QEasingCurve &item)
 {
     QDebugStateSaver saver(debug);
     debug << "type:" << item.d_ptr->type
-          << "func:" << item.d_ptr->func;
+          << "func:" << reinterpret_cast<const void *>(item.d_ptr->func);
     if (item.d_ptr->config) {
         debug << QString::fromLatin1("period:%1").arg(item.d_ptr->config->_p, 0, 'f', 20)
               << QString::fromLatin1("amp:%1").arg(item.d_ptr->config->_a, 0, 'f', 20)

src/widgets/widgets/qmainwindowlayout_p.h

@@ -88,6 +88,10 @@ class QMainWindowLayoutSeparatorHelper
     QWidget *window() { return layout()->parentWidget(); }
 
 public:
+    Q_DISABLE_COPY_MOVE(QMainWindowLayoutSeparatorHelper)
+
+    QMainWindowLayoutSeparatorHelper() = default;
+
     QList<int> hoverSeparator;
     QPoint hoverPos;