netcat-openbsd: replace patch with quilt

If run bitbake -c patch -f netcat-openbsd twice, the patch conflict
will happen, so replace the patch with quilt to avoid do_patch failed.

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>