Log Message:
geography/viking: Update to 1.9

Packaging changes:
  - Change to gtk3
  - Drop workaround for lack of NAN on NetBSD 5
  - Drop workaround for XOPEN_SOURCE as upstream no lnoger defines it

Viking 1.9 (2021-03-20)
New features since 1.8
* GPX 1.1 Support for most common Extensions (inc. Heart Rate, Power, \ 
Temperature & Cadence)
* GTK3
** Pinch Zoom support on Touchpads/Touchscreens (not GTK2 build)
* Select Tool is now the default with more intuitive behaviour to enable moving \ 
the map
* [OpenTopoMap](https://opentopomap.org) is the new Map Default
* Online Search in Left Hand Pane
* Track Statistics in Left Hand Pane
* [OSRM](http://project-osrm.org) Routing Support
* Log diagnostic Window
* DEM Colour options
* DEM Server enhanced support (NASA Earthdata login and alternative DEM server \ 
configuration)
* Ruler uses Great Circle drawing and distance.
* Single key Shortcuts support
* Improved Track Area Coverage (faster drawing, option to limit years of coverage)
* Monthly Statistics Analysis
* Native KML Parser enabling support for more KML features
* More KML export options
* Ability to convert Tracks/Routes to Waypoints and vice versa.
* Ability to 'Rotate' Routes/Tracks, i.e. to shift the start/end point of \ 
circular routes.
* Ability to Reset Preferences and Layer Defaults
* Ability to Reset Layers back to the Layer Default.
* Enable Filtering on some List Displays (hence a basic internal search).
* Support more GPX 1.0 Waypoint fields - the less commonally encountered ones.