seed geos geometry fix

This patch fixes issue when using GEOS clipping. 

More up to date GEOS library seems to assume coordinates to be set before creating linearring or polygon.

Previous code set coordinates  after creating linearring and polygon.

util/mapcache_seed.c

@@ -318,8 +318,9 @@ int ogr_features_intersect_tile(mapcache_context *ctx, mapcache_tile *tile)
 {
   mapcache_metatile *mt = mapcache_tileset_metatile_get(ctx,tile);
   GEOSCoordSequence *mtbboxls = GEOSCoordSeq_create(5,2);
-  GEOSGeometry *mtbbox = GEOSGeom_createLinearRing(mtbboxls);
-  GEOSGeometry *mtbboxg = GEOSGeom_createPolygon(mtbbox,NULL,0);
+  // linearring and polygon creation moved after coords - more recent GEOS seems to assume coordinates are set
+  GEOSGeometry *mtbbox = NULL;
+  GEOSGeometry *mtbboxg = NULL;
   int i;
   int intersects = 0;
   GEOSCoordSeq_setX(mtbboxls,0,mt->map.extent.minx);
@@ -332,6 +333,10 @@ int ogr_features_intersect_tile(mapcache_context *ctx, mapcache_tile *tile)
   GEOSCoordSeq_setY(mtbboxls,3,mt->map.extent.maxy);
   GEOSCoordSeq_setX(mtbboxls,4,mt->map.extent.minx);
   GEOSCoordSeq_setY(mtbboxls,4,mt->map.extent.miny);
+  // moved after coords - more recent GEOS seems to assume coordinates are set
+  mtbbox = GEOSGeom_createLinearRing(mtbboxls);
+  mtbboxg = GEOSGeom_createPolygon(mtbbox,NULL,0);
+
   for(i=0; i<nClippers; i++) {
     const GEOSPreparedGeometry *clipper = clippers[i];
     if(GEOSPreparedIntersects(clipper,mtbboxg)) {