bug#17300: fails to build due to defsetf, cl-define-compiler-macro in cl-macs.el (structures)

[Ivan Shmakov <ivan@siamics.net>]

Package:  emacs

	As of 20eb3d6e5262 [1], Emacs fails to build from a clean
	directory with the output like:

Loading /home/private/users/ivan/devel/emacs-2014-04-20-build/lisp/emacs-lisp/nadvice.el (source)...
Loading /home/private/users/ivan/devel/emacs-2014-04-20-build/lisp/minibuffer.el (source)...
Eager macro-expansion failure: (void-function defsetf)
Symbol's function definition is void: defsetf
make[1]: *** [bootstrap-emacs] Error 1
make[1]: Leaving directory `/home/private/users/ivan/devel/emacs-2014-04-20-build/src'

	Apparently, the “defstruct introspection” commit [2] is to
	blame, as it introduced to cl-macs.el:

	• the use of the ‘defsetf’ macro, defined in cl.el (not
	  currently required by cl-macs.el, and possibly leading to a
	  circular dependency);

	• two invocations of the ‘cl-define-compiler-macro’ in the
	  “Structures.” section /prior/ to its definition in “Compiler
	  macros.” later in the same file.

	The first issue could be solved by simply replacing defsetf by
	gv-define-simple-setter.  The solution for the second is to move
	these two invocations below the definition of the macro.

[1] http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/vc/ediff-diff.el?h=emacs-24&id=20eb3d6e5262a31147b42a9733010ce397fdc3d8
[2] http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/vc/ediff-diff.el?h=emacs-24&id=49b8b4c4a07e9e3d160367cc52d4ef4fb7f3fa22

PS.  And since when using periods in ‘;;; ’-headings within the code
	became a convention, BTW?

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