[XeTeX] Anchor names

[Akira Kakuto]

Dear Jonathan, Heiko,

> IIRC (it's a while since I looked at any of this), I believe
> Unicode bookmark strings work deliberately (not accidentally)
> - I think this came up early on as an issue, and encoding-form
> conversion was implemented to ensure that it works. 
> (It's possible there are bugs, of course, but it was _supposed_ to work!)

I have recovered the reencoding of pdf strings, since we don't have
right bookmarks without the hyperref package.
The destination in pdf:dest is also reencoded. Thus
/D<feff00e4006e0063006800f80072>
and
/Names[<feff00e4006e0063006800f80072>7 0 R]
in Heiko's exapmle.

Thanks,
Akira