re PR libgcj/27731 (Math cbrt(), cosh(), expm1(), hypot(), log1p(), sinh() and tanh() not implemented)

	PR libgcj/27731:
	* java/lang/natMath.cc (cbrt, cosh, expm1, hypot, log1p, sinh,
	tanh): New methods.
	* java/lang/Math.java (cbrt, cosh, expm1, hypot, log1p, sinh,
	tanh): Declare.

From-SVN: r114045