[build, classpath] Avoid unportable diff -u/-U

[Rainer Orth]

Paolo Bonzini <bonzini@gnu.org> writes:

> The contrib/test_summary part is okay.  I don't even know what is upstream
> for the other part, which shows that I'm not competent enough to review
> it. :-)

It lives in classpath, but so far libjava maintainers who happen to be
classpath maintainers as well have taken care of integrating such
patches upstream.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University