New glob* function.

The glob* function supports brace expansion, the **
pattern for matching zero or more path components,
as well as a sane sort for path names.

glob* relies on brace expansion written in Lisp;
the ** processing and sorting is done by a glob-compatible
C function called super_glob that uses glob.

* autoload.c (glob_set_entries, glob_instantiate): New static
functions.
(autoload_init): Register autoload of stdlib/glob module.

* glob.c (GLOB_XNOBRACE, GLOB_XSTAR): New macros.
(glob_wrap): Call super_glob instead of glob if GLOB_XSTAR
is present in flags. Avoid passing extension flags to glob.
(super_glob_find_inner, super_glob_rec, glob_path_cmp,
glob_str_cmp, super_glob): New static functions.
(glob_init): Register sys:glob-xstar, and glob-xnobrace.
sys:glob-xstar is used by glob* to request support for
the ** pattern from glob.

* stdlib/glob.tl: New file.

* tests/018/glob.tl: New file.

* txr.1: Documented.

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