[kaffe] patch: build fix for local sockets

[Robert Schuster]

Hi,
a C file from Classpath' local sockets implementation unconditionally
defined _GNU_SOURCE causing trouble in builds where this is already done.

Thanks go to Dalibor who helped me to track this down.

Regards
Robert

2007-09-12  Robert Schuster  <robertschuster at fsfe.org>

        * native/jni/java-net/gnu_java_net_local_LocalSocketImpl.c:
        Add #ifndef guard around definition of _GNU_SOURCE.
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