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/test20.ok b/src/testdir/test20.ok
new file mode 100644
index 0000000..7c50ea8
--- /dev/null
+++ b/src/testdir/test20.ok
@@ -0,0 +1,10 @@
+123start here56
+234start here67
+345start here78
+
+test text test tex rt here
+		somext
+		tesext
+test text
+
+