Make globals.h a generated header

Make globals.h a generated header
	* configure: Rebuild.
	* configure.in (NS_OBJC_OBJ): New subst.
lib-src
	* make-docfile.c: Unconditionally include stdlib.h.
	(generate_globals): New global.
	(xrealloc): New function.
	(main): Handle '-g'.  Call start_globals, write_globals.
	(scan_file): Conditionally call put_filename.
	(start_globals): New function.
	(struct global): New.
	(num_globals, globals): New globals.
	(add_global, compare_globals, write_globals): New functions.
	(scan_c_file): Update for "-g".
	(scan_lisp_file): Fail if "-g".
	(enum global_type): New.
src
	* Makefile.in (NS_OBJC_OBJ): New variable.
	(base_obj): Rename from 'obj'.
	(obj): New variable.
	(globals.h, gl-stamp, $(obj)): New targets.
	(GLOBAL_SOURCES): New variable.
	* globals.h: Remove.
	* nsselect.m (Vselection_alist): Define.  Reverts part of
	r102904.
	* buffer.c: Don't use "no_cell" for name of kill-buffer-hook's
	variable.
	* xselect.c (Vselection_alist): Define.  Reverts part of r102908.