check-code: examine magic pattern matching against contents of a file
Before this patch, check-code examines "magic" pattern (e.g.
'^#!.*python') matching against not contents of a file, but name of
it.
This unintentionally omits code checking against Python source file,
of which filename doesn't end with "*.py" or "*.cgi", even though
contents of it starts with "#!/bin/python" or so.
In this change, 'pre' refers contents of file 'f'.
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