PlainSocketImpl.java (read): Remove declaration.

PlainSocketImpl.java (read): Remove declaration.

	* gnu/java/net/PlainSocketImpl.java (read): Remove declaration.
	(write): Likewise.
	(SocketInputStream, SocketOutputStream): Declare `read' and `write'
	native. Remove implementations which called back into
	PlainSocketImpl.
	Remove unneccessary overridden methods.
	* gnu/java/net/natPlainSocketImplNoNet.cc (read): Move
	implementation
	to inner class PlainSocketImpl.SocketInputStream.
	(write): Likewise.
	* gnu/java/net/natPlainSocketImplPosix.cc: As above.
	* gnu/java/net/natPlainSocketImplWin32.cc: As above.
	* gnu/java/net/SocketInputStream.java: Remove unused file.
	* gnu/java/net/SocketOutputStream.java: Likewise.
	* Makefile.am: Build CNI headers for PlainSocketImpl.SocketInputStream
	and SocketOutputStream.
	* Makefile.in: Rebuilt.

From-SVN: r71724