Relevant to several ports which required rewriting their buildsystems from scratch in CMake (#603).

Because Vcpkg has opinions about how packages should be laid out and linked, we have all the information needed to generate general-purpose CMake configure scripts for every library we package (even those that don't use CMake!). This would greatly simplify the job of maintainers who need to rewrite library buildsystems in CMake to better support our configuration options (UWP, static linking the CRT, etc) because they would be able to rely on find_package() to do the heavy lifting.

Now, it is certainly not our intention to permanently fork libraries, so if a library did decide to start supplying its own native CMake configure scripts, we would have to make (breaking!) changes to switch.