Minor cleanups of str_collate fix.
* fns.c (str_collate): Move decl from here ... * lisp.h (str_collate): ... to here. * sysdep.c (str_collate): Prune away some of the forest of ifdefs. Remove unnecessary casts. Use SAFE_NALLOCA to avoid potential problems with integer overflow. Don't assume setlocale succeeds. Remove unnecessary test before restoring locale via setlocale, and free the copied setlocale string when done with it. Fixes: debbugs:18051
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