4dcebc1822
This makes dynarmic installable, and also adds a CMake package config file, that allows projects to use `find_package(dynarmic)` to import the library. I know #636 adds the same thing, but while experimenting with the different install options in https://github.com/merryhime/dynarmic/pull/636#discussion_r725656034 I ended up with a working patch, so I'm proposing this as well. This implements solution 2.