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.

t/deps/test2.do

@@ -2,6 +2,7 @@ rm -f t2.count
 redo t2
 redo t2
 OUT=$(cat t2.count | wc -l)
+. ../skip-if-minimal-do.sh
 if [ "$OUT" != 2 ]; then
 	echo "t2: expected 2"
 	exit 43