qtwayland: check also that the destination for private headers exists before installing them

* it looks like with 5.12 the QtCompositor headers are actually in QtWaylandCompositor directory
  and ${D}${includedir}/QtCompositor/${SHRT_VER}/QtCompositor/private/ doesn't exist causing
  do_install to fail

$ ls /OE/build/oe-core/tmp-glibc/work/core2-64-oe-linux/qtwayland/5.12.3+gitAUTOINC+bcdc00bcdc-r0/image/usr/include/QtWaylandCompositor/5.12.3/QtWaylandCompositor/private/
qtwaylandcompositor-config_p.h     qwaylandpointer_p.h                        qwayland-server-wayland.h                     qwaylandxdgdecorationv1_p.h            qwldatadevice_p.h                       wayland-hardware-integration-server-protocol.h
qtwaylandcompositorglobal_p.h      qwaylandqtwindowmanager_p.h                qwayland-server-xdg-decoration-unstable-v1.h  qwaylandxdgshellintegration_p.h        qwldataoffer_p.h                        wayland-ivi-application-server-protocol.h
qwaylandcompositorextension_p.h    qwaylandquickhardwarelayer_p.h             qwayland-server-xdg-shell.h                   qwaylandxdgshell_p.h                   qwldatasource_p.h                       wayland-qt-key-unstable-v1-server-protocol.h
qwaylandcompositor_p.h             qwaylandquickitem_p.h                      qwayland-server-xdg-shell-unstable-v5_p.h     qwaylandxdgshellv5integration_p.h      qwlhardwarelayerintegrationfactory_p.h  wayland-qt-windowmanager-server-protocol.h
qwaylanddestroylistener_p.h        qwaylandquickshellsurfaceitem_p.h          qwayland-server-xdg-shell-unstable-v6.h       qwaylandxdgshellv5_p.h                 qwlhardwarelayerintegration_p.h         wayland-server-buffer-extension-server-protocol.h
qwaylandinputmethodcontrol_p.h     qwaylandseat_p.h                           qwaylandshell_p.h                             qwaylandxdgshellv6integration_p.h      qwlhardwarelayerintegrationplugin_p.h   wayland-text-input-unstable-v2-server-protocol.h
qwaylandiviapplication_p.h         qwayland-server-hardware-integration.h     qwaylandsurface_p.h                           qwaylandxdgshellv6_p.h                 qwlhwintegration_p.h                    wayland-touch-extension-server-protocol.h
qwaylandivisurfaceintegration_p.h  qwayland-server-ivi-application.h          qwaylandtextinputmanager_p.h                  qwlbuffermanager_p.h                   qwlqtkey_p.h                            wayland-wayland-server-protocol.h
qwaylandivisurface_p.h             qwayland-server-qt-key-unstable-v1.h       qwaylandtextinput_p.h                         qwlclientbufferintegrationfactory_p.h  qwlqttouch_p.h                          wayland-xdg-decoration-unstable-v1-server-protocol.h
qwaylandkeyboard_p.h               qwayland-server-qt-windowmanager.h         qwaylandtouch_p.h                             qwlclientbufferintegration_p.h         qwlregion_p.h                           wayland-xdg-shell-server-protocol.h
qwaylandkeymap_p.h                 qwayland-server-server-buffer-extension.h  qwaylandview_p.h                              qwlclientbufferintegrationplugin_p.h   qwlserverbufferintegrationfactory_p.h   wayland-xdg-shell-unstable-v5-server-protocol_p.h
qwaylandoutputmode_p.h             qwayland-server-text-input-unstable-v2.h   qwaylandwlshellintegration_p.h                qwlclientbuffer_p.h                    qwlserverbufferintegration_p.h          wayland-xdg-shell-unstable-v6-server-protocol.h
qwaylandoutput_p.h                 qwayland-server-touch-extension.h          qwaylandwlshell_p.h                           qwldatadevicemanager_p.h               qwlserverbufferintegrationplugin_p.h

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

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