Patch for PhysFS

[David Hedbor]

The attached patch makes PhysFS handle the case when the current
directory (as returned by getcwd()) has been deleted.
Fix 1, platform/unix.c:
  Only retry getcwd if the error is ERANGE. Before it retried till the
  malloc failed in the case of the directory not existing.
Fix 2: physfs.c:
  If __PHYSFS_platformCurrentDir() return's NULL, use the root as the
  base dir. Bad solution but the best I can think of (alternative :
  use /tmp or Windows TEMP dir?).

-- 
[ Below is a random fortune, which is unrelated to the above message. ]
Entreprenuer, n.:
	A high-rolling risk taker who would rather
	be a spectacular failure than a dismal success.
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