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Cygwin headers are now a bit more correct in handling feature test macros, so use _GNU_SOURCE when building for Cygwin, as well. (Notwithstanding f381c27c , we should probably have always been using _GNU_SOURCE, since asprintf() is used by mesa in places) Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com> Reviewed-by: Jon Turney <jon.turney@dronecode.org.uk>
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