c++: use YYRHSLOC.

c++: use YYRHSLOC.

	* data/lalr1.cc (YYRHSLOC): New.
	(YYLLOC_DEFAULT): Use it.
	* data/glr.cc: If location_type was user defined, do not include
	location.hh, and do not produce location.hh and position.hh.
	* tests/calc.at (YYLLOC_DEFAULT): Use YYRHSLOC.
	Check that glr.cc supports user defined location_type.
	* NEWS: Document this.
(cherry picked from commit bb9191dd311e4c6d80f8dd12c6a7ce9254404fbc)

Conflicts:

	ChangeLog
	NEWS
	data/lalr1.cc
	tests/calc.at