Code review comment for lp:~metacollin/kicad/boosting_boost

After the next stable release, this patch will be lost. I plan on ripping out all of the custom dependency download, patch, and build code from the CMake files after the next stable. If someone needs this to build dependencies on their platform than it will have to be maintained as an external project. The complexity it has added to the project configure and build has been a major source of pain. I recommend creating a kicad-boost project that downloads, patches, and builds boost for the platforms that need it.