These changes are only to support MonoTouch. FlickrNet works with Mono out of the box.
The changes in the patch are to support the "lighter" version of the class libraries that ships with MonoTouch. MonoTouch is actually based on the Silverlight API profile, instead of the desktop one as it avoids the very large System.Configuration
stack and a handful of other ugly dependencies.
In addition to using the lighter stack, it also uses the proper Apple recommended directory for the cache for the iPhone.