[distcc] [patch] Add a few missing bits for OS X support

[Rafael Ávila de Espíndola]

Resending since it looks like the previous message fell through the cracks.

The attached patch is not complete, but it adds enough features and
fixes to let distcc pump build a slightly patched version of firefox
on OS X.

What the patch does is

* add support for -isysroot and -arch
* Fix a really nasty corner case:
  * CompressFiles::Compress uses os.makedirs to create a directory
(foo)  for one compilation unit
  * Another compilation unit does the equivalent of '#include
"foo/../bar.h"'
  * The compilation unit uses no other file in foo
  * We conclude that we don't have to create a dummy
foo/forcing_technique_271828

Cheers,
Rafael
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