CC Mode: Don't do c-backward-syntactic-ws following a forward movement

CC Mode: Don't do c-backward-syntactic-ws following a forward movement

This was happening in, e.g., c-forward-type, which moves over whitespace at
the end of the scanned type.  This WS movement can exit a comment or a macro,
such that a c-backward-syntactic-ws does not return to the desired point, but
to before the entire comment/macro.

* lisp/progmodes/cc-engine.el (c-forward-keyword-prefixed-id)
(c-forward-id-comma-list, c-forward-noise-clause, c-forward-keyword-clause)
(c-forward-name, c-forward-type): Add a new &optional parameter `stop-at-end'
which when non-nil means "do not move over syntactic WS after performing the
main job", and adapt the internals of these macros and functions accordingly.
(c-forward-declarator, c-forward-decl-or-cast-1): In the calls to
c-forward-type and c-forward-name, set the stop-at-end argument to t, and call
c-forward-sytactic-ws later.