c_std=c11 in meson default_options
Closes: #1020 (closed)
Co-authored-by: Kristian Høgsberg krh@bitplanet.net
Acked-by: Karol Herbst kherbst@redhat.com
Acked-by: Eric Engestrom eric@engestrom.ch
Signed-off-by: Yurii Kolesnykov root@yurikoles.com