It parses vDSO in memory (just like CRIU does) and
then use direct calls to vDSO entries instead of
.plt/.got bundle. The reason for that -- I must
be sure we're able to proceed calls without relying
on libc anyhow.

Note the test is x86-64 specific so I don't turn in
on in test suite by default.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>