Changed --with-zeus configure option into --with-isapi, since its more descriptive (and since there are now different ways to configure PHP+Zeus)
Added changes to environment variable manipulations, to support Zeus 3.3.8 and increase compatibility between Zeus/IIS/Apache. Now, URLs like http://foo.org/file.php/a/b/c/d work correctly. # While testing, it looks like IIS+ISAPI is mishandling URLs like the above. # The PATH_TRANSLATED given by ISAPI includes the /a/b/c/d bit of the URL, # so using this var to find the script file to open on disk will not work. # We now use SCRIPT_FILENAME if it is present (in Zeus 3.3.8) # IIS doesn't seem to set this variable, it might be necessary to mangle # SCRIPT_NAME and APPL_PHYSICAL_PATH together?