[File] Rise RP/749 ... strange libmagic behaviour with bytes

[Dr. Werner Fink]

Currently both the python magic from file-5.47 and python-magic-0.4.27 report

```
AssertionError: 'PDF document, version %.%, 2 page(s)' != 'PDF document, version 1.2, 2 page(s)'
- PDF document, version %.%, 2 page(s)
?                       ^ ^
+ PDF document, version 1.2, 2 page(s)
?                       ^ ^
```

resp.

```
test/libmagic_test.py:23: in assert_result
    self.assertIn(result.name, self.expected_name)
E   AssertionError: 'PDF document, version %.%, 2 page(s)' not found in ('PDF document, version 1.2', 'PDF document, version 1.2, 2 pages', 'PDF document, version 1.2, 2 page(s)')
```

-- 
  "Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool." -- Edward Burr
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