Remove directory listing (used for debugging)

.travis.yml

@@ -85,7 +85,6 @@ install:
   - if [ "${SPEC}" = "android-g++" ]; then
         wget --quiet http://www.grubba.com/gstreamer-1.0-android-universal-1.14.4.tar.bz2 &&
         tar jxf gstreamer-1.0-android-universal-1.14.4.tar.bz2 -C ${TRAVIS_BUILD_DIR} &&
-        ls -lh ${TRAVIS_BUILD_DIR} &&
         wget --quiet https://s3-us-west-2.amazonaws.com/qgroundcontrol/dependencies/Qt5.11.0-android_armv7-min.tar.bz2 &&
         tar jxf Qt5.11.0-android_armv7-min.tar.bz2 -C /tmp &&
         wget --quiet https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip &&