Only declare gets for C++ < 2014 on Solaris (PR libstdc++/78979)

Only declare gets for C++ < 2014 on Solaris (PR libstdc++/78979)

	Backport from mainline
	2017-01-13  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR libstdc++/78979
	* inclhack.def (solaris_gets_c11, solaris_gets_cxx14)
	(solaris_std_gets_cxx14, solaris_stdlib_noreturn): New fixes.
	* fixincl.x: Regenerate.
	* tests/base/iso/stdio_iso.h [SOLARIS_GETS_C11_CHECK,
	SOLARIS_GETS_CXX14_CHECK, SOLARIS_STD_GETS_CXX14_CHECK,
	SOLARIS_STDLIB_NORETURN_CHECK]: New tests.

From-SVN: r245034