Detect when we hit limit in backward search in c-just-after-func-arglist-p

This fixes a bug reported by Yasushi SHOJI <yasushi.shoji@gmail.com> to
emacs-devel on 2018-11-26, where wrong analysis and fontification occurred.

* lisp/progmodes/cc-engine.el (c-beginning-of-statement-1): Add new parameter
HIT-LIM which, if non-nil causes the function to return nil rather than 'same
when we reach the backward search limit without finding the beginning of
statement.
(c-just-after-func-arglist-p): Supply argument t to this new parameter in call
to c-beginning-of-statement-1.
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