`file --mime` outputs extraneous info when run on ELFs

[Mike Frysinger]

normally the --mime option outputs just the mime type and nothing else, but 
when it is run on an ELF, we get a lot of extra junk in there:

$ file --mime /bin/bash
/bin/bash: application/x-executable, for GNU/Linux 2.6.9, dynamically linked 
(uses shared libs), stripped

clearly we dont want anything after "application/x-executable" :)
-mike
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