Add support for tee, splice and vmsplice.
Originally from: vibi sreenivasan <vibi_sreenivasan@cms.com>
Riku: squashed patches together, added a test to configure
and removed compliler warning by picking up correct type for
splice param
Signed-off-by: vibisreenivasan <vibi_sreenivasan@cms.com>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>