ImageFile.MAXBLOCK is still too low

[pgcd]

While the issue might be addressed for most cases, there seems to be a related problem:
the line

sorl-thumbnail/sorl/thumbnail/engines/pil_engine.py

Line 243 in de3a621

if 'icc_profile' in image_info:

adds the ICC Profile to the image - which means that the encoder error may popup yet again for very large ICC profiles (I am looking at a 63K RGB Lab profile on a 120x80 thumbnail), which results in an "Encoder Error -2".

I'm not sure what the best solution would be (strip the ICC profile as well, or add it to the MAXBLOCX), so I'm not submitting a PR yet.