[Qemu-devel] Patch v4 : POSIX timer implementation for linux-user.

[erikd]

Changes from v3 version of patch (suggestions from agraf on irc):
* Fix checkpatch.pl issues.
* Use ARRAY_SIZE instead of custom macro.
* Pass 0 as last arg to unlock_user_struct() in host_to_target_itimerspec.

Changes from original patch:
* Call host's libc functions directly rather than _syscall*() (as suggested
  by Peter Maydell).
* Remove un-needed #defines.