win32/socket: introduce qemu_socket_unselect() helper

A more explicit version of qemu_socket_select() with no events.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-Id: <20230221124802.4103554-8-marcandre.lureau@redhat.com>
3 files changed