Centralize subprocess creation in a single function.

Getting the vfork + execve combination right isn't easy, and the code
was partially duplicated between callproc.c and process.c.  Centralize
the spawn operation in a single function that deals with the nasty
details.  Going forward, we should be able to use posix_spawn from
either libc or Gnulib (or CreateProcessW on Windows) in the non-pty
case.

* src/callproc.c (emacs_spawn): New function to start an asynchronous
subprocess.  Merge code from 'call_process' and 'create_process' into
this function.
(call_process): Use new 'emacs_spawn' function.
(child_setup): Make static, since there are no users outside this
compilation unit left.
(CHILD_SETUP_TYPE): Move from header file, since there are no users
outside this compilation unit left.

* src/process.c (create_process): Use new 'emacs_spawn' function.

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