hg: bsd-port/bsd-port/jdk: . Use sendfile(2) if its available (which it is on MacOS X and FreeBSD).

[glewis at eyesbeyond.com]

Changeset: 62dc2d00133f
Author:    Greg Lewis <glewis at eyesbeyond.com>
Date:      2010-03-24 22:19 -0700
URL:       http://hg.openjdk.java.net/bsd-port/bsd-port/jdk/rev/62dc2d00133f

. Use sendfile(2) if its available (which it is on MacOS X and FreeBSD).
  Otherwise return IOS_UNSUPPORTED and allow the calling code to handle
  the fallback rather than using our own (buggy) read/write loop here.

Submitted by:		Michael Allman <msa at allman.ms>
FreeBSD support by:	Greg Lewis

! src/solaris/native/sun/nio/ch/FileChannelImpl.c