libjava build failure on branch for sparc-sun-solaris2.7

[Joe Buck]

(Re: build failure due do #define for bind that depends on _XOPEN_SOURCE
or something similar).

Mark writes:
> Sorry for the breakage.  If you do not feel like fixing it, it is
> certainly my regression, and I will fix it.  Put it in GNATS, mark it
> high priority.  But, I would be very grateful if you would fix it. :-)

I've verified that solaris 2.7 now bootstraps.