Modify "ls" to sort its data faster, using the new gnulib mpsort

module rather than qsort.  This is particularly a win in
environments where strcoll is slow, since mpsort typically calls
strcoll less often than qsort does.
* bootstrap.conf (gnulib_modules): Add mpsort.
* src/ls.c: Include mpsort.h.
(sorted_file, sorted_file_alloc): New vars, for a new vector of
pointers to the file info, for speed.
(clear_files, extract_dirs_from_files, sort_files, print_current_files):
(print_many_per_line, print_horizontal, print_with_commas):
(calculate_columns): Set and use new vector.
(initialize_ordering_vector): New function.

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