Fixed a few compile warnings and one compile error.

fixed recurrent entrance to add_cgi_vars

initial import of all these files. This was previously the apache_hooks
branch of the apache sapi. Now it lives on its own. General functionality
seems to be working, though there may be a

initial import of all these files. This was previously the apache_hooks
branch of the apache sapi. Now it lives on its own. General functionality
seems to be working, though there may be a problem with some
output buffering, most likely due to the way that sapi_deactivate needs
to be mangled with here.

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