[libjava] Restore HAVE_INET6 tests (PR libgcj/52645)

[Rainer Orth]

It turns out I've been over-eager removing Tru64 UNIX support from
libjava, breaking at least the HP-UX 11.00 build.  The following patch
fixes this, tested by Dave Anglin on hppa2.0w-hp-hpux11.00 and
bootstrapped on i386-pc-solaris2.11.

Ok for mainline?

Thanks.
	Rainer


2012-03-21  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR libgcj/52645
	* gnu/java/net/natPlainDatagramSocketImplPosix.cc (setOption):
	Restore HAVE_INET6 check.
	* gnu/java/net/natPlainDatagramSocketImplWin32.cc (setOption):
	Likewise.

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Rainer Orth, Center for Biotechnology, Bielefeld University