Christian Hergert 455e622121 gio: add g_file_enumerator_enumerate_children()
This adds the necessary functions to create an emumerator to enumerate
children directly from another enumerator. Doing so allows for the use
of openat() using the directory FD. This ensures that enumeration may
still succeed even though a parent directory could have been moved in
the process. It also may potentially reduce the overhead on accessing
the child directory handle on some file-systems.

An implementation for GLocalFile is provided when on unix systems
supporting openat() with O_DIRECTORY.

It may be interesting for GFileEnumerator to gain additional operations
such as move, delete, or create in the future so that the directory
fd may be used there as well. Requiring the round-trip to a GFile can
be an inherent race. However, to do this, we probably want additional
file operation interfaces that can be implemented by enumerators as
we will run out of padding quickly.

Fixes #1745
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