cmake: Allow building without Luajit
By default Neovim searched a Luajit instalation and linked against the luajit library. In practice Neovim only requires luajit to run the unit tests. All other targets only require lua and the correct lua modules. This commit: 1. Remove the strict dependency on Luajit 2. Makes the unittest target depend on the lua 'ffi' module. If the module is not available the target is not enabled and a message is displayed.
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