Patch: PR 6081

[Rainer Orth]

Tom Tromey writes:
> 
> Could you try this patch?  It fixes PR 6081.  It works fine on my
> Linux box, but of course that doesn't help us test for the bug, it
> just verifies that I didn't break anything.

make install-data-local works fine with this patch.  Since
libjava/Makefile.am already uses a couple of GNU make features, introducing
a new one won't be a problem.  Perhaps this should be documented clearly in
install.texi?

	Rainer