* java/net/DatagramPacket.java
	(length): Made packge-private to make it accessible via CNI.
	(maxlen): New field.
	(DatagramPacket): Cleaned up.
	(setSocketAddress): Add message to exception.
	(setData): Call other setData().
	(setData): Call setLength().
	(setLength): Initialize maxlen too.
	* gnu/java/net/natPlainDatagramSocketImplPosix.cc (peekData):
	Get maximal length from maxlen field, set length field directly.
	(receive): Likewise.
	* gnu/java/net/natPlainDatagramSocketImplWin32.cc (peekData):
	Get maximal length from maxlen field, set length field directly.
	(receive): Likewise.

From-SVN: r74278