Update libc & linux-raw-sys to support loongarch64

[zhaixiaojuan]

The LoongArch architecture (LoongArch) is an Instruction Set Architecture (ISA) that has a RISC style. Documentations: ISA: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html ABI: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html More docs can be found at: https://loongson.github.io/LoongArch-Documentation/README-EN.html Due to the lower version of libc & linux-raw-sys, an error occurs when compiling on the loongarch64 architecture. For example:

error[E0432]: unresolved import `crate::general`
  --> /home/alpine/.cargo/registry/src/index.crates.io-6f17d22bba15001f/linux-raw-sys-0.3.1/src/lib.rs:84:16
   |
84 |     use crate::general::{cmsghdr, msghdr};
   |                ^^^^^^^ could not find `general` in the crate root

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[jackandroselv]

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