Update libc 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, an error occurs when compiling on the loongarch64 architecture:

error[E0412]: cannot find type `c_long` in the crate root
  --> /home/alpine/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.124/src/unix/mod.rs:76:24
   |
76 |         pub tv_nsec: ::c_long,
   |                        ^^^^^^ not found in the crate root
   |
help: consider importing this type alias
   |
146+         use ffi::c_long;
   |
help: if you import `c_long`, refer to it directly
   |
76 -         pub tv_nsec: ::c_long,
76 +         pub tv_nsec: c_long,
   |

[KuabeM]

Thank you! I'll merge this and probably to a quick release afterwards :)