Clean up scoping rule of predefined single-word vars.
* lisp/startup.el (argv, argi): Make lexically scoped. * lisp/emacs-lisp/float-sup.el (pi): Use internal-make-var-non-special. * lisp/emacs-lisp/cl-macs.el: Use lexical-binding. Rename cl-bind-* to cl--bind-*. * lisp/files.el: Don't require `cl' since it doesn't use it. * lisp/emacs-lisp/pcase.el, lisp/emacs-lisp/macroexp.el: Add coding cookie. * src/eval.c (Fmake_var_non_special): New primitive. (syms_of_eval): Defsubr it. * src/lread.c (syms_of_lread): Mark `values' as lexically scoped.
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