Do not install native-image.

Author: boris-spas

.travis.yml

@@ -17,7 +17,6 @@ install:
           tar -xzf graalvm.tar.gz
           export JAVA_HOME="$(pwd)/graalvm-ce-$GRAALVM_VERSION"
           if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export JAVA_HOME="$JAVA_HOME/Contents/Home"; fi
-          "$JAVA_HOME/bin/gu" install native-image
         else
           if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export JAVA_HOME=$(/usr/libexec/java_home); fi
         fi