* docs/configopts.html: Edit.

	* libio/Makefile.am (INCLUDES): Remove duplicates, simplify.
	* libio/Makefile.in: Regenerate.
	* libmath/Makefile.am (INCLUDES): Remove duplicates, simplify.
	* libmath/Makefile.in: Regenerate.
	* libsupc++/Makefile.am (INCLUDES): Remove duplicate.
	* libsupc++/Makefile.in: Regenerate.

	* Makefile.am (AM_MAKEFLAGS): Add GLIBCPP_INCLUDES,
	TOPLEVEL_INCLUDES, LIBMATH_INCLUDES, LIBIO_INCLUDES,
	CSHADOW_INCLUDES up here.
	* Makefile.in: Regenerate.
	* src/Makefile.am (CSHADOW_INCLUDES): Add include/c_std, include/c
	for shadow headers.
	(myinstallheaders): Change glibcpp_includedir to GLIBCPP_INCLUDES.
	Move GLIBCPP_INCLUDES, TOPLEVEL_INCLUDES, LIBMATH_INCLUDES,
	LIBIO_INCLUDES, CSHADOW_INCLUDES up Makefile hierarchy.
	* src/Makefile.in: Regenerate.

	* include/c: New directory.
	* include/c/bits/(std_cassert.h, std_cctype.h, std_cerrno.h,
	std_cfloat.h, std_climits.h, std_clocale.h, std_cmath.h,
	std_csetjmp.h, std_csignal.h, std_cstdarg.h, std_cstddef.h,
	std_cstdio.h, std_cstdlib.h, std_cstring.h, std_ctime.h,
	std_cwchar.h, std_cwctype.h): Add, moving from...
	* include/bits: ...here.
	* include/c_std: New directory.
	* include/c_std/bits/*: Populate from...
	* shadow: ...here. Remove directory.

From-SVN: r36806