weston-launcher: use CLOEXEC on fallback path
weston-launcher: use CLOEXEC on fallback path

If there is no weston-launcher available, launcher-util.c will fall back
to opening the given file itself. It that case it does not set the
close-on-exec flag, and will presumably leak the file descriptor to
children.

Use O_CLOEXEC on the fallback path, too.

Signed-off-by: Pekka Paalanen <6c0263d81461c956d504307112a4ce25eaacc3d1@gmail.com>

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