Connecting IRT dev interfaces for fdio and filename.

Connecting the irt dev interfaces (when available).

Adding hooks for:
  __nacl_irt_unlink;
  __nacl_irt_truncate;
  __nacl_irt_lstat;
  __nacl_irt_link;
  __nacl_irt_rename;
  __nacl_irt_symlink;
  __nacl_irt_chmod;
  __nacl_irt_access;
  __nacl_irt_readlink;
  __nacl_irt_utimes;
  __nacl_irt_fchdir;
  __nacl_irt_fchmod;
  __nacl_irt_fsync;
  __nacl_irt_fdatasync;
  __nacl_irt_ftruncate;

Changed type signature of getcwd to match irt.

Connected pre-existing hooks:
  __nacl_irt_mkdir
  __nacl_irt_rmdir
  __nacl_irt_chdir
  __nacl_irt_getcwd

Updated irt.h and added irt_dev.h

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3583
R=mcgrathr@chromium.org

Review URL: https://codereview.chromium.org/145263007
9 files changed