Revamp acl_extended_fd/acl_extended_file to avoid open(2) call

Calling open from acl_extended_file{_nofollow} indiscriminately may hang
if the file is a FIFO.  Ultimately the FIFO implementation needs a thorough
rewrite, but for the time being we better do what stat(2) and friends do:
Just create an fhandler directly.

	* sec_posixacl.cc (__acl_extended_fh): New static function calling
	fhandler::facl.
	(acl_extended_fd): Just call __acl_extended_fh.
	(__acl_extended_file): Take just a path_conv as parameter and
	create temporary fhandler to call __acl_extended_fh.
	(acl_extended_file): Create path_conv from incoming path and
	call __acl_extended_file on it.
	(acl_extended_file_nofollow): Ditto.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

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