Patch: java.io.Piped*

[Tom Tromey]

I'm checking in this patch:

2000-04-20  Tom Tromey  <tromey@cygnus.com>

	Fix for PR java.io/204:
	* java/io/PipedInputStream.java, java/io/PipedReader.java,
	java/io/PipedOutputStream.java, java/io/PipedWriter.java: Imported
	from Classpath.

This fixes the indicated PR and "merges" these classes with the
Classpath implementation.  In this case I just chose the Classpath
implementation over the libgcj one, since (1) that implementation
doesn't have this bug, (2) the Classpath implementation has javadoc
comments, and (3) there's no other real difference between the two.

Tom