run-integration-tests: show make command line executed

That makes it much easier to figure out what to type to just run one
specific test for debugging.

test/run-integration-tests.sh

@@ -16,9 +16,9 @@ FAILURES=0
 
 cd "$(dirname "$0")"
 for TEST in TEST-??-* ; do
-        echo -e "\n--x-- Starting $TEST --x--"
+        echo -e "\n--x-- Running $TEST --x--"
         set +e
-        make -C "$TEST" "BUILD_DIR=$BUILD_DIR" $args
+        ( set -x ; make -C "$TEST" "BUILD_DIR=$BUILD_DIR" $args )
         RESULT=$?
         set -e
         echo "--x-- Result of $TEST: $RESULT --x--"