[patch] Allow compilation on the Hurd

[Sjoerd Simons]

Hi,

  Attached are two patches needed to get Hal with the dummy backend to compile
  on the Hurd. Based on a patch by Samuel Thibault reported in the debian
  bugtracking system (#444574).

  osspec.patch implements osspec_privileged_init in the dummy backend

  pathmax.patch gets rid of users of PATH_MAX. The hurd doesn't have a PATH_MAX
  limitation. And i personally also dislike using a static maximum for paths,
  so the patch dynamically allocates enough space where needed.

  Ok to commit these ?

  Sjoerd
-- 
The clash of ideas is the sound of freedom.
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