Log Message:
freeimage: Update to 3.18.0

Release 3.18.0 is a maintenance release that mainly brings updates of its third \ 
party libraries.
The library has been updated with the new ZLib (1.2.11), LibJPEG (9c), LibPNG \ 
(1.6.35), LibTIFF (4.0.9), LibRaw (0.19.0), LibWebP (1.0.0), OpenEXR (2.2.1).
Other significant improvements concern better support for JPEG saving (when \ 
using 32-bit CMYK images) and PSD saving.
Lastly, the library contains many bug fixes provided by our users (will concern \ 
especially plugins PCX, TIFF, XPM, GIF, TARGA, PSD, BMP, DDS, PNG, HDR).
As usual, check the changes log for full details (especially for bug fixes) and \ 
check also the updated FreeImage documentation.