Patch for broken ICC profile in PNG files

[mqualmann]

We have been notified of a problem with digiKam writing metadata to PNG files, after which the ICC profile is broken.

https://bugs.kde.org/show_bug.cgi?id=401970

Exiv2 uses a fixed profile name "ICC PROFILE" with 11 characters + zero separator. The profile name can vary between 1-79 characters. Also a warning of the libpng with wrong ICC profile CRC checksum fixes this patch.

Maik
pngIccProfileName.txt

[D4N]

Please open a pull request.

Thanks!

[clanmills]

Thanks for letting us know about this.

We're in "code freeze" for v0.27 which we expect to release on 28 December 2018. We're planning quarterly "dot" releases for v0.27 during 2019 and 2020. I'd like to defer this patch for v0.27.1 which is scheduled for 31 March 2019.

[piponazo]

Fixed in #618. I'll apply the changes into master too.