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This fixes some issues where the types were causing different alignment
rules for Windows than we expect elsewhere.

This supercedes !48, and is based upon ZUHONG TAO's work there to include
the necessary changes for alignment fixes.

We don't need to use dzl_clear_pointer() anymore now that GLib has access
to g_clear_pointer() that performs similar checks as dzl_clear_pointer().

This ensures that we start hiding functions that do not have our export
macros applied.

Fixes #4

If we take the cost of having O(h) directory FDs open (where `h'
is the height of the directory path from the root), then we can
reduce the number of ignored directory checks we must make. We
only need to walk past all the files with the ignored directory
as a path prefix.

https://bugzilla.gnome.org/show_bug.cgi?id=791400

We now only call this ignored function from the main thread.

This tries to avoid having to have such strict thread-safety requirements
at the potential for a slight race condition at startup (which always
exists anyway).

We want to hit this the same way each time and synchronize with the
mutex for the private data.

The ignore callback MUST be thread-safe.

This allows ignoring some portions of the tree so that we don't create
watches for things like build directories or other random data we know
isn't important.

Since GFileMonitor uses a single inotify FD, we can use a bunch
of GFileMonitor while only using a single FD and not risk
hitting the fd ulimit. We still have a max watch limit with
inotify, but we're in better shape there as the max value is
much larger. (We probably race against tracker there, but
we'll see).