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Add support for loongarch cpu

1

Add ```loongarch``` support, the new architecture launched by China's ```Loongson```. It can be compiled and run normally under ```loongarch``` architecture. [loongarch cpuinfo](https://github.com/torvalds/linux/blob/master/arch/loongarch/kernel/proc.c#L49-L64)

Fix https://github.com/mate-desktop/engrampa/issues/515

add loongarch architecture support

3

Add ```loongarch``` support, the new architecture launched by China's ```Loongson```. It can be compiled and run normally under ```loongarch``` architecture. [loongarch cpuinfo](https://github.com/torvalds/linux/blob/master/arch/loongarch/kernel/proc.c#L49-L64)