当主 Unity 运行时作为单独的库构建时的 BuildFile.role 值。
在大多数平台上，Unity 运行时还是播放器的主要可执行文件，但在有些平台上，它被拆分为一个单独的文件，支持使用更小且更易于自定义的主要可执行文件。
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