* lisp/url/url-util.el (url-percentage): Remove Emacs 19 compat code. * lisp/erc/erc-backend.el (erc-server-coding-system): * lisp/gnus/mm-util.el (mm-iso-8859-x-to-15-table): Remove Emacs 19 compat code; coding-system-p is fboundp. * lisp/progmodes/cfengine.el (cfengine-fill-paragraph): Remove Emacs 21 compat code.