* java/lang/natString.cc (init(gnu.gcj.runtime.StringBuffer)):
	New method.
	Include gnu/gcj/runtime/StringBuffer.h.
	* java/lang/String.java (init(gnu.gcj.runtime.StringBuffer)): New
	native method.
	(String(gnu.gcj.runtime.StringBuffer)): Use it.

From-SVN: r69890