Make C++11 uniform init syntax work. New keywords "final" and "override"

Make C++11 uniform init syntax work.  New keywords "final" and "override"

cc-engine.el (c-back-over-member-initializer-braces): New function.
(c-guess-basic-syntax): Set `containing-sex' and `lim' using the new
function.

cc-fonts.el (c-font-lock-declarations): Check more carefully for "are we
at a declarator?" using c-back-over-member-initializers.

cc-langs.el (c-type-modifier-kwds): include "final" and "override" in
the
C++ value.