Disable the tests that don't work with minimal/do.

...only when running under minimal/do, of course.

The tests in question mostly fail because they're testing particular
dependency-related behaviour, and minimal/do doesn't support dependencies,
so naturally it doesn't work.

clean.do

@@ -1,3 +1,8 @@
+if [ -e .do_built ]; then
+	while read x; do
+		rm -f "$x"
+	done <.do_built
+fi
 redo t/clean
 rm -f *~ .*~ */*~ */.*~ *.pyc
-rm -rf .redo t/.redo
+rm -rf t/.redo