Enable epoll on Python manylinux1

The Python packages built for Linux and uploaded to PyPI are required to
target a standardized platform specification dubbed `manylinux1`, which
tries to cover a vast array of Linux distributions, thereby emulating a
legacy lowest-common-denominator distribution, with an old `glibc` that
does not support `epoll_create1`, but provides the `epoll_create`
interface.  While there are race condition risks associated with
utilizing the latter interface and setting the `O_CLOEXEC` flag
immediately on the file descriptor returned by `epoll_create`, the
payoff is well worth the risks for our Python users, who currently end
up falling back on `poll` polling engine when downloading our Linux
binary packages.

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