It's quite minimal at moment and provides only two helpers

 - vdso_redirect_calls, to patch vdso area redirectling
   calls to some new place.

 - vdso_fill_symtable, to parse vma area as vdso library
   and fill symbols table with offsets and names.

Because these routines will be needed in both regular criu
code and restorer code -- we compile it in pie format.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>