Do not allow out-of-range character position in Fcompare_strings.
* src/fns.c (validate_subarray): Add prototype. (Fcompare_substring): Use validate_subarray to check ranges. Adjust comment to mention that the semantics was changed. Also see http://lists.gnu.org/archive/html/emacs-devel/2014-06/msg00447.html. * lisp/files.el (dir-locals-find-file, file-relative-name): * lisp/info.el (Info-complete-menu-item): * lisp/minibuffer.el (completion-table-subvert): Prefer string-prefix-p to compare-strings to avoid out-of-range errors. * lisp/subr.el (string-prefix-p): Adjust to match strict range checking in compare-strings. * test/automated/fns-tests.el (fns-tests-compare-string): New test.
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