如何交叉编译一个基于LoongArch架构的LFS（Linux From Scratch）系统。
CLFS_For_LoongArch64-20210831：
对应的CLFS系统：loongarch64-clfs-system-20210831
交叉工具链：loongarch64-clfs-20210831-cross-tools
CLFS_For_LoongArch64-20210822：
对应的CLFS系统：loongarch64-clfs-system-20210822
交叉工具链：loongarch64-clfs-20210812-cross-tools
CLFS_For_LoongArch64-20210818：
对应的CLFS系统：loongarch64-clfs-system-20210818
交叉工具链：loongarch64-clfs-20210812-cross-tools
CLFS_For_LoongArch64-20210812：
对应的CLFS系统：loongarch64-clfs-system-20210812
交叉工具链：loongarch64-clfs-20210812-cross-tools
CLFS_For_LoongArch64-20210801：
对应的CLFS系统：loongarch64-clfs-system-20210801
交叉工具链：loongarch64-clfs-20210801-cross-tools
CLFS_For_LoongArch32：updated by @chiro2001.