[BZ #715]

[BZ #715]

	* Makefile (installed-stubs): New variable.
	Set to $(inst_includedir)/gnu/stubs.h if $(biarch) is no,
	or to $(inst_includedir)/gnu/stubs-$(biarch).h if otherwise.
	[$(biarch) != no] (install-others-nosubdir): Add $(installed-stubs).
	($(inst_includedir)/gnu/stubs.h): Use $(installed-stubs) for this
	rule's target.
	($(inst_includedir)/gnu/stubs.h): New target, install from ...
	* include/stubs-biarch.h: New file.

	* shlib-versions (i.86-.*-.*): Add WORDSIZE64 line mapping to x86_64.

	* Makeconfig ($(common-objpfx)soversions.mk): Depend on Makeconfig.
	Emit defn for variable `biarch'.

	* include/stub-tag.h: Update comment.