[patch] Support New NIO in IcedTea

[C. K. Jester-Young]

Attached is my patch for building New NIO [1] (aka NIO2) on IcedTea.
Many thanks to Andrew John Hughes for the -b33 patches for IcedTea, and
for the --with-project support; these helped cut down the size of my
patch by two-thirds. :-)

The main ``meat'' of the patch is icedtea-nio2-genfiles.patch; this
patches up the pre-generated NIO files so that they reflect the changes
made in the NIO2 repository.

As I'm writing this, I'm currently building against nio2-b94; I have got
these patches working with nio2-b93 in the past, so if the -b94 build
breaks, I'll send more patches. Meanwhile, hopefully this gives readers
something to play with. :-)

I'm not entirely sure of the legal requirements for patches to be
accepted into IcedTea. I have already signed the SCA, so if that's all
that's needed, then that's great!

Many thanks,
	---Chris K.

[1] http://openjdk.java.net/projects/nio/
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