Auto-generate EXFUN using make-docfile

Auto-generate EXFUN using make-docfile

src
	* window.c (Fset_window_margins, Fset_window_fringes)
	(Fset_window_scroll_bars, Fset_window_vscroll): No longer static.
	* textprop.c (Fprevious_property_change): No longer static.
	* syntax.c (Fsyntax_table_p): No longer static.
	* process.c (Fget_process, Fprocess_datagram_address): No longer
	static.
	* keymap.c (Flookup_key, Fcopy_keymap): No longer static.
	* keyboard.c (Fcommand_execute): No longer static.
	Remove EXFUN.
	* insdel.c (Fcombine_after_change_execute): No longer static.
	* image.c (Finit_image_library): No longer static.
	* fileio.c (Fmake_symbolic_link): No longer static.
	* eval.c (Ffetch_bytecode): No longer static.
	* editfns.c (Fuser_full_name): No longer static.
	* doc.c: (Fdocumentation_property, Fsnarf_documentation): No
	longer static.
	* buffer.c (Fset_buffer_major_mode, Fdelete_overlay): No longer
	static.
	* dired.c (Ffile_attributes): No longer static.
	* composite.c (Fcomposition_get_gstring): No longer static.
	* callproc.c (Fgetenv_internal): No longer static.

	* ccl.h: Remove EXFUNs.
	* buffer.h: Remove EXFUNs.
	* dispextern.h: Remove EXFUNs.
	* intervals.h: Remove EXFUNs.
	* fontset.h: Remove EXFUN.
	* font.h: Remove EXFUNs.
	* dosfns.c (system_process_attributes): Remove EXFUN.
	* keymap.h: Remove EXFUNs.
	* lisp.h: Remove EXFUNs.
	* w32term.h: Remove EXFUNs.
	* window.h: Remove EXFUNs.
	* xsettings.h: Remove EXFUN.
	* xterm.h: Remove EXFUN.

lib-src
	* make-docfile.c (enum global_type) <FUNCTION>: New constant.
	(struct global) <value>: New field.
	(add_global): Add 'value' argument.
	(compare_globals): Sort functions at the end.
	(close_emacs_globals): New function.
	(write_globals): Handle functions.
	(scan_c_file): Call add_global for DEFUN.