Snippets for osm-gps-map 1.2.2 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/osm-gps-map/1.2.2/1.fc46/data/logs/s390x/build.log.

• osm-gps-map-widget.c:1215:32: warning: 'last_lon' may be used uninitialized [-Wmaybe-uninitialized]
   1215 |         else if (fabs(tp->rlon - last_lon) > M_PI && x != last_x)
        |                       ~~~~~~~~~^~~~~~~~~~