Don't call purecopy in progmodes/*.el

Don't call purecopy in progmodes/*.el

* lisp/progmodes/compile.el (compile-command):
* lisp/progmodes/etags.el (tags-compression-info-list):
* lisp/progmodes/grep.el (grep-program, find-program, xargs-program):
* lisp/progmodes/js.el (interpreter-mode-alist):
* lisp/progmodes/python.el (interpreter-mode-alist):
* lisp/progmodes/ruby-mode.el (auto-mode-alist, interpreter-mode-alist):
* lisp/progmodes/vera-mode.el: Remove calls to purecopy.

(cherry picked from commit 04408e198f1acc2eeae2ca299de994ba38116d1a)