Fix for build on Windows.

--HG--
branch : develop

src/app/geometry/varc.cpp

@@ -32,6 +32,7 @@
 #include <QLineF>
 #include <QPainterPath>
 #include <QPointF>
+#include <QtCore/qmath.h>
 
 #include "../container/vformula.h"
 

src/app/geometry/vspline_p.h

@@ -33,6 +33,7 @@
 #include "../options.h"
 #include "vpointf.h"
 #include <QLineF>
+#include <QtCore/qmath.h>
 
 #ifdef Q_CC_GNU
     #pragma GCC diagnostic push

src/app/widgets/vmaingraphicsview.cpp

@@ -42,7 +42,7 @@
 //---------------------------------------------------------------------------------------------------------------------
 GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view)
   : QObject(view), _view(view), _modifiers(Qt::ControlModifier), _zoom_factor_base(1.0015),
-    target_scene_pos(QPointF()), target_viewport_pos(QPointF()), _numScheduledScalings(0), anim(nullptr)
+    target_scene_pos(QPointF()), target_viewport_pos(QPointF()), anim(nullptr), _numScheduledScalings(0)
 {
   _view->viewport()->installEventFilter(this);
   _view->setMouseTracking(true);