configure.ac: Check that we can use O_CLOEXEC with pipe2().
Needed for EL5. Based on: https://github.com/rurban/mosh/commit/c70c3707e65b42ac9b9da937e9c255211330805e
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Needed for EL5. Based on: https://github.com/rurban/mosh/commit/c70c3707e65b42ac9b9da937e9c255211330805e