Bug#803724: licensecheck still broken

[Dominique Dumont]

Hello

Unfortunately, licensecheck is still broken: the encoding detection based on 
`file` command does not work as expected. 

For instance, in icedove. the file mozilla/js/src/vtune/jitprofiling.h contains 
windows-1252 character in a comment:

$ file --mime-type --mime-encoding mozilla/js/src/vtune/jitprofiling.h
mozilla/js/src/vtune/jitprofiling.h: text/plain; charset=unknown-8bit

By default, licensecheck refuses to parse files with unknown encoding.

I'm now convinced that using `file` to detect charset is more trouble than it's 
worth. 

Unless someone has a better idea, I'm going to revert most of the modification 
I've done with regard to encoding. licensecheck will go back to:
- use a regexp to decide whether to parse a file or not
- don't change encoding of copyright owners.

The latter means that user will have to deal with any non utf8 character 
produced by licensecheck. 

All the best

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