Add missing feature test macro to C++17 status table

	* doc/xml/manual/status_cxx2017.xml: Add feature test macro for
	P0040R3.
	* doc/html/*: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@271571 138bc75d-0d04-0410-961f-82ee72b054a4
4 files changed