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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 663800e18fef by Gregory P. Smith in branch '3.2':
This local change was lost during the fixing of issue17192 to update
http://hg.python.org/cpython/rev/663800e18fef

New changeset 7438d202e380 by Gregory P. Smith in branch '2.7':
This local change was lost during the fixing of issue17192 to update
http://hg.python.org/cpython/rev/7438d202e380

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<http://bugs.python.org/issue10309>
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