[CRIU] CRIU ARM branch

[alekskartashov at parallels.com]

Dear colleagues,

This patchset implements the ARM support in CRIU.

Known issues:

* The following tests fail in the ARM version:
  - static/pty03,
  - transition/file_read,
  - static/file_fown,
  - static/ipc_namespace,
  - static/ipc.

* The test static/session01 contains x86-specific lock operations so it has to be excluded
  while testing on ARM.

* The test static/futex segfaults when the program crtools is compiled with the switch -O2.


This patchset takes into account notes by Pavel Emelyanov about the previous version
of the patchset:

* Keep the current x86-specific build scripts intact.
* Fix all compilation warnings in the ARM branch.

-- 
Sincerely yours,
Alexander Kartashov