Set LD_LIBRARY_PATH consistently in travis tests

Remove inconsistency between functional and unit test environments and make it
possible to substitute bitcoin-qt and bitcoin-node in place of bitcoind in
python tests, or to link bitcoind against shared libraries.

ci/test/06_script_b.sh

@@ -30,12 +30,12 @@ fi
 
 if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
   BEGIN_FOLD functional-tests
-  DOCKER_EXEC test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
   END_FOLD
 fi
 
 if [ "$RUN_FUZZ_TESTS" = "true" ]; then
   BEGIN_FOLD fuzz-tests
-  DOCKER_EXEC test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} -l DEBUG ${DIR_FUZZ_IN}
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} -l DEBUG ${DIR_FUZZ_IN}
   END_FOLD
 fi