* java/lang/String.java (String): New constructor.
	* gnu/gcj/runtime/natStringBuffer.cc: New file.
	* gnu/gcj/runtime/StringBuffer.java: New file.
	* Makefile.in: Rebuilt.
	* Makefile.am (ordinary_java_source_files): Added
	gnu/gcj/runtime/StringBuffer.java.
	(nat_source_files): Added gnu/gcj/runtime/natStringBuffer.cc.

From-SVN: r47883