Clean up flymake.el

Clean up flymake.el

* lisp/progmodes/flymake.el (flymake, flymake-error-bitmap)
(flymake-warning-bitmap, flymake-fringe-indicator-position)
(flymake-compilation-prevents-syntax-check)
(flymake-start-syntax-check-on-newline)
(flymake-no-changes-timeout, flymake-gui-warnings-enabled)
(flymake-start-syntax-check-on-find-file, flymake-log-level)
(flymake-xml-program, flymake-master-file-dirs)
(flymake-master-file-count-limit)
(flymake-allowed-file-name-masks): Relocate.
(flymake-makehash, flymake-float-time)
(flymake-replace-regexp-in-string, flymake-split-string)
(flymake-get-temp-dir): Remove.
(flymake-popup-menu, flymake-nop, flymake-make-xemacs-menu)
(flymake-current-row, flymake-selected-frame)
(flymake-get-point-pixel-pos): Remove xemacs compatibity and
related functions.

Fixes: debbugs:16077