QGroundControlQmlGlobal: Remove deprecated intersect function

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/QmlControls/QGroundControlQmlGlobal.cc

@@ -221,7 +221,13 @@ bool QGroundControlQmlGlobal::linesIntersect(QPointF line1A, QPointF line1B, QPo
 {
     QPointF intersectPoint;
 
-    return QLineF(line1A, line1B).intersect(QLineF(line2A, line2B), &intersectPoint) == QLineF::BoundedIntersection &&
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
+    auto intersect = QLineF(line1A, line1B).intersect(QLineF(line2A, line2B), &intersectPoint);
+#else
+    auto intersect = QLineF(line1A, line1B).intersects(QLineF(line2A, line2B), &intersectPoint);
+#endif
+
+    return  intersect == QLineF::BoundedIntersection &&
             intersectPoint != line1A && intersectPoint != line1B;
 }