[PATCH] Hooks

Any objections to committing this patch? It passes all tests.

Log:

Windows scripts require a valid stdout handle or else 'bad handle'
messages are sent to stderr, cluttering up the error message that is
sent back to the client. This patch sets up a stdout handle pointing to
the null device when hooks are run to remedy the problem.

*** Note that autogen.sh/configure (or gen-make.py on Windows) will need
to be run to generate the null device definitions needed to compile.

* configure.in
  Add a definition for the null device on unixy OS'.

* subversion/libsvn_repos/hooks.c
  (run_hook_cmd): Setup stdout to point to the null device
  rather than leaving it as an invalid handle.

* svn_private_config.hw
  Add a definition for the null device on Windows.

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