* 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
