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/dirtest/test.do

@@ -9,6 +9,7 @@ redo t1
 redo-ifchange t1
 C1="$(wc -l <dir1/log)"
 C2="$(wc -l <log)"
+. ../../skip-if-minimal-do.sh
 if [ "$C1" != 1 -o "$C2" != 2 ]; then
 	echo "failed: t1>t1, c1=$C1, c2=$C2" >&2
 	exit 55