[issue21574] Port image types detections from PIL to the imghdr module

[Claudiu Popa]

Claudiu Popa added the comment:

In general, the patch looks good, I left a couple of comments on Rietvld. It should be applied to 3.5 only. Also, there are some image test files which aren't included in this patch, could you update it to include them? Thanks.

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<http://bugs.python.org/issue21574>
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