sh/tests: Add a second kind of binary scripts without #!

One of the reasons for git commit
e0f5c1387df23c8c4811f5b24a7ef6ecac51a71a was to make "actually portable
executables" work. Add a test that is more like those.

MFC after: 1 week

(cherry picked from commit 52981a1694be7a70013e5149c020706c9b6411f9)