clients: Fix libexec clients install
clients: Fix libexec clients install

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