Add missing #includes for FreeBSD build

QFile is no longer included implicitly via other headers,
so include it explicitly in the FreeBSD framebuffer code.
This is needed to make it compile (at all, although there
are also API changes to chase and general bitrot).

Change-Id: I3801a39503f545a24a3b2c58122774b5697358e9
Reviewed-by: David Edmundson <davidedmundson@kde.org>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/plugins/generic/bsdmouse/qbsdmouse.cpp

@@ -39,6 +39,7 @@
 
 #include "qbsdmouse.h"
 
+#include <QFile>
 #include <QSocketNotifier>
 #include <QStringList>
 #include <QPoint>

src/plugins/platforms/bsdfb/qbsdfbscreen.cpp

@@ -41,6 +41,7 @@
 #include "qbsdfbscreen.h"
 #include <QtFbSupport/private/qfbcursor_p.h>
 #include <QtFbSupport/private/qfbwindow_p.h>
+#include <QtCore/QFile>
 #include <QtCore/QRegularExpression>
 #include <QtGui/QPainter>