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/curse/test.do

@@ -2,4 +2,5 @@
 redo-ifchange 1.n0 2.n0 3.n0
 DEPS=$(seq 10 | sed 's/$/.n1/')
 redo-ifchange $DEPS
+. ../skip-if-minimal-do.sh
 . ./check-2.sh