[travis] Run Qt5 tests with osgeo4travis in $PATH

This allows running the gdal processing tests and other subprocesses which have
been manually built like server applications.

ci/travis/linux/qt5/script.sh

@@ -1,10 +1,9 @@
 export PYTHONPATH=${HOME}/osgeo4travis/lib/python3.3/site-packages/
+export PATH=${HOME}/osgeo4travis/bin:${HOME}/osgeo4travis/sbin:${PATH}
+export LD_LIBRARY_PATH=${HOME}/osgeo4travis/lib
 export CTEST_PARALLEL_LEVEL=1
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-# ccache -o max_size=150M
-# ccache -o run_second_cpp=true
-
 xvfb-run ctest -V -E "$(cat ${DIR}/blacklist.txt | paste -sd '|' -)" -S ./qgis-test-travis.ctest --output-on-failure
 # xvfb-run ctest -V -S ./qgis-test-travis.ctest --output-on-failure