weston-launch: Move child setup and exec to its own function
weston-launch: Move child setup and exec to its own function

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