Log Message:
graphics/geeqie: Organize clutter/map more clearly

(This commit only reorders lines and does not intend to change any
behavior.)

In geeqie, clutter is optional, but it is required in order to have
the map widget.  The map option (libchamplain) currently enables
clutter.  Separate clutter and map CONFIGURE and bl3 includes and add
comments to make this easier to understand.