Improve robustness of new string-collation code.
* configure.ac (newlocale): Check for this, not for uselocale. * src/sysdep.c (LC_COLLATE, LC_COLLATE_MASK, freelocale, locale_t) (newlocale, wcscoll_l): Define substitutes for platforms that lack them, so as to simplify the mainline code. (str_collate): Simplify the code by assuming the above definitions. Use wcscoll_l, not uselocale, as uselocale is too fragile. For example, the old version left the Emacs in the wrong locale if wcscoll reported an error. Use 'int', not ptrdiff_t, for the int result. Report an error if newlocale fails. Fixes: debbugs:18051
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