Colin Walters 426fab1eca gio-unix: Use EPOLL_CLOEXEC by default
First, there's no reason not to use the new `epoll_create1` system call,
which quickly obsoleted `epoll_create` which has an obsolete and
unused size argument.

But more specifically, it offers `EPOLL_CLOEXEC` which we want
to use for general hygeine - there's no reason to potentially
leak this file descriptor to forked processes.

(GLib itself carefully closes file descriptors when forking child
 processes, but it may be linked with other software that doesn't;
 notably in my case for example the Rust standard library does not
 do this and hence relies more on the application code using
 `O_CLOEXEC` and variants)

This is just a drive-by fix; I saw the system call when I was using
`strace` to debug something else in rpm-ostree.
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