* gnu/java/nio/FileChannelImpl.java
	(fd): Type FileDescriptor instead of int.
	(lengthInternal): Removed.
	(FileChannelImpl): Fixed arguments, check type of file object.
	(size): Made it native.
	(implPosition): New native method.
	(implTruncate): New native method.
	(position): Implemented.
	(truncate): Implemented.
	(nio_mmap_file): Changed arguments.
	(nio_munmap_file): Changed arguments.
	(nio_msync): Changed arguments.
	* gnu/java/nio/natFileChannelImpl.cc
	(lengthInternal): Removed.
	(size): New method.
	(implPosition): New method.
	(implTruncate): New method.
	(nio_mmap_file): Changed arguments.
	(nio_munmap_file): Changed arguments.
	(nio_msync): Changed arguments.

From-SVN: r63668