replace all F_DUPFD_CLOEXEC with os_dupfd_cloexec()

replace all F_DUPFD_CLOEXEC with os_dupfd_cloexec()

All squashed into a single commit because it shouldn't have any
behaviour change, except that it might work now on platforms where it
was broken because F_DUPFD_CLOEXEC is not supported but FD_CLOEXEC is.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5369>