linux: don't delay EPOLL_CTL_DEL operations (#4328)

Perform EPOLL_CTL_DEL immediately instead of going through
io_uring's submit queue, otherwise the file descriptor may
be closed by

linux: don't delay EPOLL_CTL_DEL operations (#4328)

Perform EPOLL_CTL_DEL immediately instead of going through
io_uring's submit queue, otherwise the file descriptor may
be closed by the time the kernel starts the operation.

Fixes: https://github.com/libuv/libuv/issues/4323

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