patch 8.2.1439: tiny and small builds have no test coverage

Problem:    Tiny and small builds have no test coverage.
Solution:   Restore tests that do not depend on the +eval feature.
            (Ken Takata, closes #6696)
diff --git a/src/testdir/test21.ok b/src/testdir/test21.ok
new file mode 100644
index 0000000..38ff89e
--- /dev/null
+++ b/src/testdir/test21.ok
@@ -0,0 +1,4 @@
+this lines ends in a

+this one doesn't
+this one does

+and the last one doesn't