[issue10309] dlmalloc.c needs _GNU_SOURCE for mremap()

[Hallvard B Furuseth]

Changes by Hallvard B Furuseth <h.b.furuseth at usit.uio.no>:


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versions: +Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10309>
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