* gcc.dg/builtins-config.h: Ensure we use -std=c99 on solaris2.
	* gcc.dg/torture/builtin-convert-1.c,
	gcc.dg/torture/builtin-convert-2.c,
	gcc.dg/torture/builtin-convert-3.c,
	gcc.dg/torture/builtin-power-1.c: Use -std=c99 on solaris2.

From-SVN: r117548