Changes in dconf 0.29.2
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 - Service: When corrupt GVDB files are found, they are now
   transparently backed up and replaced with an empty database.
   (Philip Withnall, !8)
 - Replace all hard-coded /etc path with sysconfdir. This is useful for
   JHBuild environments and systems that don't want to use /etc/dconf.
   (Ting-Wei Lan; !21, #739229)
 - Engine: Change overflow thresholds in subscription counts from
   GMAXUINT32 to GMAXUINT (Daniel Playfair Cal; !20)
 - Change meson flag used to build Gtk-Doc from enable-gtk-doc to
   gtk_doc (Daniel Playfair Cal; !19)
 - Declare libdconf_service as a dependency to fix the build in
   massively parallelised environments (Emmanuele Bassi; !22)