加快UE4 Setup.bat执行速度

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http://blog.csdn.net/goodboychina/article/details/51800813

编译UE4，需要先运行Setup.bat。
Setup.bat的主要作用就是下载并安装UE4的依赖项。
实际负责下载依赖项的是：/Engine/Binaries/DotNET/GitDependencies.exe
它的用法：

Usage:   GitDependencies [options]Options:   --all                         Sync all folders   --include=<X>                 Include binaries in folders called <X>   --exclude=<X>                 Exclude binaries in folders called <X>   --prompt                      Prompt before overwriting modified files   --force                       Always overwrite modified files   --root=<PATH>                 Set the repository directory to be sync   --threads=<N>                 Use N threads when downloading new files   --dry-run                     Print a list of outdated files and exit   --max-retries                 Override maximum number of retries per file   --proxy=<user:password@url>   Sets the HTTP proxy address and credentials   --cache=<PATH>                Specifies a custom path for the download cache   --cache-size-multiplier=<N>   Cache size as multiplier of current download   --cache-days=<N>              Number of days to keep entries in the cache   --no-cache                    Disable caching of downloaded files

为了提高下载速度可以使用–threads=20 参数，指定多线程下载。

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