[PATCH] replace call to file(1) with libmagic

[Markus Benning]

Hello Mark,

i did some research on optimizing Amavis/Spamassassin in our test setup
with NYTProf.
I found that replacing the call to the external file(1) tool with
calls to File::LibMagic increased the throughput from 4.1 to 4.8 msg/s.
It also simplifies the code in determine_file_types().

 Markus


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