CC Mode: Prevent lone ids being parsed as types unless in decl arglists

This fixes bug #59051.

* lisp/progmodes/cc-engine.el (c-forward-decl-or-cast-1): In the test for the
last invocation of c-fdoc-shift-type-backward before CASE 1, additionally
test CONTEXT not being an arglist or BACKUP-AT-TYPE being non-nil.

lisp/progmodes/cc-engine.el

@@ -10678,6 +10678,8 @@ This function might do hidden buffer changes."
 	(c-forward-syntactic-ws))
 
       (when (and (not got-identifier)
+		 (or backup-at-type
+		     (not (memq context '(arglist decl))))
 		 (or (and new-style-auto
 			  (looking-at c-auto-ops-re))
 		     (and (or maybe-typeless backup-maybe-typeless)