file-jpeg: Fix the copyright and license notices of jpeg-icc.*
This code was originally written by Thomas G. Lane and Todd Newman, and proposed for inclusion in the Independent JPEG Group's software. However, that fell through when Tom left the IJG. It was not written by Marti Maria - Little cms only had a copy of that code.
This code has recently been merged into libjpeg-turbo, so it seems reasonable to now consider libjpeg-turbo as the canonical source of these files. However, since the GIMP carries the original version of the code proposed for IJG's JPEG, and doesn't contain any of the more recent and minor tweaks made during its inclusion in libjpeg-turbo, only the original copyright holders (ie., Thomas G. Lane and Todd Newman) are mentioned.
The relevant license text was lifted from the Independent JPEG Group's software, similar to the way it's done in Chromium and other users of this code.