libv4l: enable libv4l2 usage with devices which just support read()
libv4l: enable libv4l2 usage with devices which just support read()

From: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>

libv4l: enable libv4l2 usage with devices which just support read(), this
allows applications to work with mpeg capture devices like the cx18, which
only do read() and only support mpeg and some exotic raw format
(which libv4l can convert).

Thanks to Simon Farnsworth <simon.farnsworth@onelan.com> for testing this.

Priority: normal

Signed-off-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>

jaechoon2/libv4l,philips/libv4l