clients: support ivi-application.xml for clients/window.c
clients: support ivi-application.xml for clients/window.c

Signed-off-by: Nobuhiko Tanibata <92313f26b3566e64b50391ce0051fc0e1f775402@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

krezovic/weston,Fantu/compositor-spice,mchalupa/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,Gnurou/weston,Fantu/compositor-spice,xorgy/weston,sir-murray/weston,Fantu/compositor-spice,giucam/weston,mchalupa/weston,giucam/weston,jonnylamb/weston,jonnylamb/weston,eyolfson/weston,eyolfson/weston,udoprog/weston,udoprog/weston,krezovic/weston,kwm81/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,kwm81/weston,Gnurou/weston