PR libgcj/27271:
	* java/util/zip/ZipFile.java (getInputStream): Call addDummyByte
	on PartialInputStream.
	(PartialInputStream.dummyByteCount): New field.
	(PartialInputStream.fillBuffer): Handle dummy byte.
	(PartialInputStream.read): Likewise.
	(PartialInputStream.addDummyByte): New method.

From-SVN: r115378