* configure: Added check to detect POSIX sleep function.

* eval.c (eval_init): Register new open_tail function as intrinsic.

* match.c (complex_snarf, complex_stream): Update calls to
make_stdio_stream and make_pipe_stream to take fewer arguments.
(match_files): Support a stream object as a data source specification
in place of a string.

* parser.l (parse_reset): Update call to make_stdio_stream to take
fewer arguments.

* stream.c: Inclusion of <unistd.h> made properly conditional.
(struct stdio_handle): pid member defined as pid_t only if we have fork
functionality, otherwise defined as int.
(tail_get_line, tail_get_char, tail_get_byte): New static functions.
(tail_ops): New static structure.
(make_stdio_stream_common): New static structure.
(make_stdio_stream, make_pipe_stream): These functions lose the input
and output parameters, which ended up never used. Reimplemented
in terms of new common function.
(make_tail_stream): New function.
(make_pipevp_stream): Reimplemented in terms of new common function.
(open_file, open_command): Simplified by removal of useless local
variables and their computation, which used to be extra arguments to
make_stdio_stream and make_pipe_stream.
(open_tail): New function.
(stream_init): Calls to make_stdio_stream updated.

* stream.h (make_stdio_stream, make_pipe_stream): Declarations updated.
(make_tail_stream, open_tail): Declared.

* txr.c (txr_main): Calls to make_stdio_stream updated.

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