stdalign: port to clang 3.7.0 Problem reported by Herbert J. Skuhra in: http://lists.gnu.org/archive/html/emacs-devel/2016-02/msg00476.html * lib/stdalign.in.h (alignas): Fix typo that prevented 'alignas' from being defined on clang 3.7.0, which has a buggy stdalign.h. See: https://llvm.org/bugs/show_bug.cgi?id=26547