The FACE Technical Standard, Edition 3.0 and later require the
definition of the subcommand SOCKCLOSE in <devctl.h>.
Reference: https://www.opengroup.org/face
Remove stray commas. Include <sys/cdefs.h> for __restrict (includes
<stddef.h> indirectly).
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>