travis: we are currently not using the dataset, so no download needed

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@71869 15284696-431f-4ddb-bdfa-cd5b030d7da7

.travis/linux.install.sh

@@ -38,7 +38,3 @@ sudo apt-get install --no-install-recommends \
     libblas-dev \
     liblapack-dev \
     python-numpy
-
-# test dataset
-wget http://grass.osgeo.org/sampledata/north_carolina/nc_basic_spm_grass7.tar.gz
-tar xzf ./nc_basic_spm_grass7.tar.gz