guality.exp: Run also c-c++-common/guality/ tests.

guality.exp: Run also c-c++-common/guality/ tests.

	* gcc.dg/guality/guality.exp: Run also c-c++-common/guality/ tests.
	* gcc.dg/guality/guality.h: Include unistd.h.  Make the header usable
	in C++.
	(gualcvt): New overloaded inline.
	(GUALCVT): Use it for C++.
	* g++.dg/guality/guality.exp: New.
	* g++.dg/guality/guality.h: New.
	* g++.dg/guality/redeclaration1.C: New test.
	* g++.dg/dg.exp: Prune also guality/* tests.
	* gcc.dg/guality/pr43141.c: Moved to...
	* c-c++-common/guality/pr43141.c: ... here.

From-SVN: r162266