bug#27617: 26.0.50; cl--random-state initialized to old-style vector

[Christopher Wellons]

The global variable cl--random-state is still being initialized to the 
old defstruct vector format. See lisp/emacs-lisp/cl-lib.el:296. This 
breaks all random number functions when the STATE argument isn't 
supplied:

   $ emacs -Q --batch -l cl-lib --eval '(cl-random 10)'
   Wrong type argument: cl--random-state, [cl--random-state-tag -1 30 ...]