* java/lang/Class.h (getSignature): Updated.
	* java/lang/Class.java (getSignature): Updated.
	* java/lang/natClass.cc (getSignature): Added `is_constructor'
	argument.
	(getConstructor): Ensure constructor is public.
	(_getConstructors): Check for public-ness of constructor when
	`declared' is false, not when it is true.

From-SVN: r31241