Georges Basile Stavracas Neto authored Apr 27, 2018 and Philip Withnall committed Apr 30, 2018

Getting the canonical filename is a relatively common
operation when dealing with symbolic links.

This commit exposes GLocalFile's implementation of a
filename canonicalizer function, with a few additions
to make it more useful for consumers of it.

Instead of always assuming g_get_current_dir(), the
exposed function allows passing it as an additional
parameter.

This will be used to fix the GTimeZone code to retrieve
the local timezone from a zoneinfo symlink.

(Tweaked by Philip Withnall <withnall@endlessm.com> to drop g_autofree
usage and add some additional tests.)

https://bugzilla.gnome.org/show_bug.cgi?id=111848