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in c-ares 1.34.0, it addressed a regression with custom socket callbacks due to DNS cookie support. because 1.34.0's release tarball failed to include some header file. so let's claim the support to c-ares < 1.33 or >= 1.34.1.
Refs #2472
Signed-off-by: Kefu Chai kefu.chai@scylladb.com