[issue23657] Don't do isinstance checks in zipapp

[Paul Moore]

Paul Moore added the comment:

Updated patch. Added the requested test and a set of tests for the command line API. This also highlighted a bug in the command line --info option, which is also fixed.

Coverage now:

Name          Stmts   Miss  Cover   Missing
-------------------------------------------
test_zipapp     254     12    95%   252-257, 263-268
zipapp          102      2    98%   30, 192
-------------------------------------------
TOTAL           356     14    96%

Remaining misses are Unix-only tests (this was run on Windows) and the __main__ block.

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Added file: http://bugs.python.org/file38606/duck_typed_zipapp.v3.patch

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<http://bugs.python.org/issue23657>
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