sol2.h (TARGET_OS_CPP_BUILTINS): Define __STDC_VERSION__=199901L, _XOPEN_SOURCE=600...

sol2.h (TARGET_OS_CPP_BUILTINS): Define __STDC_VERSION__=199901L, _XOPEN_SOURCE=600 for C++.

	gcc:
	* config/sol2.h (TARGET_OS_CPP_BUILTINS): Define
	__STDC_VERSION__=199901L, _XOPEN_SOURCE=600 for C++.

	fixincludes:
	* inclhack.def (solaris__restrict, solaris_complex_cxx): New fixes
	* fixincl.x: Regenerate.
	* tests/base/complex.h [SOLARIS_COMPLEX_CXX_CHECK]: New test.
	* tests/base/sys/feature_tests.h: New file.

	libstdc++-v3:
	* testsuite/26_numerics/headers/cmath/c99_classification_macros_c.cc:
	Add *-*-solaris2.1[0-9]* to dg-xfail-if, dg-excess-errors.

From-SVN: r161089