patch 9.0.0637: syntax of commands in Vim9 script depends on +eval feature

Problem:    Syntax of commands in Vim9 script depends on +eval feature.
Solution:   Use same syntax with and without the +eval feature.
diff --git a/src/testdir/test10.ok b/src/testdir/test10.ok
new file mode 100644
index 0000000..5776cea
--- /dev/null
+++ b/src/testdir/test10.ok
@@ -0,0 +1,2 @@
+first line
+last line