Define variable values for linux/loong64

[abner-chenc]

Signed-off-by: Guoqi Chen chenguoqi@loongson.cn
Co-authored-by: Jiantao Shan shanjiantao@loongson.cn

[abner-chenc]

There is already a pull request for loong64 support, but it has been turned off. see #17. by @merore

• loong64 GOARCH value reserved for LoongArch architecture: https://golang.org/doc/go1.17.
• github issues: all: port to linux/loong64 golang/go#46229
• golang :https://github.com/loongson/go/tree/loong64-master
• LoongArch documents:https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
• OS: https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/tag/2.3
• kernel: https://github.com/loongson/linux/tree/loongarch-next

go version && go test ./...

go version devel go1.18-9dfe8c02b8 Mon Jan 10 21:40:35 2022 +0800 linux/loong64
ok      github.com/tklauser/go-sysconf  0.004s
ok      github.com/tklauser/go-sysconf/cgotest  0.003s

[tklauser]

Thanks