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Fix make distcheck

This is broken subdir-objects is currently broken in automake.
See http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13928 for the bug
status, enabling it will cause xfpm to fail a make distcheck build.
g_value_array is deprecated

Also remove some unused code that was commented out.
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Revert "g_value_array is deprecated"

This reverts commit 2a7c86ceb4eda43cceeb450715ed8c37cd248c94.
Not sure there's a good way to port the dbus-glib code to using
GValue, revert until we port xfpm to GIO's dbus code.