test - inclusion os system dependencies

Author: Schuch666

DESCRIPTION

@@ -24,6 +24,7 @@ URL: https://atmoschem.github.io/eixport/
 BugReports: https://github.com/atmoschem/eixport/issues/
 Depends: R (>= 3.5.0)
 Imports: sf, ncdf4, raster, methods, cptcity, utils, data.table
+SystemRequirements: netcdf, gdal, geos, proj
 Encoding: UTF-8
 LazyData: no
 RoxygenNote: 7.3.2