[PATCH]: svn_io_start_cmd2 which can create pipes

Hello

While writing svntar (http://svn.borg.ch/tmp/svntar/0.0.2/) I needed a
function similar to svn_io_start_cmd but I needed stdin to be a pipe.

After reading APR docs and playing around I found apr_procattr_io_set.
First I copied svn_io_start_cmd and modified it to do what I want, and it
works fine. So I thought let's write a patch...

Then I found out that the only caller of svn_io_start_cmd does the same
thing but in a different way. It is run_hook_cmd in libsvn_repos/hooks.c .

Is there a reason it does it different?
If not a large part of the code in there can be removed when using
svn_io_start_cmd2.

  - Martin

[[[
Add svn_io_start_cmd2 which can create pipes if needed.

* subversion/libsvn_subr/io.c
   (svn_io_start_cmd2): Renamed from svn_io_start_cmd and added pipe_flags.
   (svn_io_start_cmd): Calls svn_io_start_cmd2 with pipe_flags=0.

* subversion/include/svn_io.h
   (SVN_IO_PIPE_STDIN,SVN_IO_PIPE_STDOUT,SVN_IO_PIPE_STDERR): New defines.
   (svn_io_start_cmd2): New function.
   (svn_io_start_cmd): Added @deprecated comment.

* subversion/include/svn_error_codes.h
   (SVN_ERR_IO_FILE_AND_PIPE_ERROR): New error code.
]]]

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