[Pkg-rust-maintainers] Bug#1088333: rust-libseccomp-sys: Add support for loongarch64

[zhangdandan]

Source: rust-libseccomp-sys
Version: 0.2.1-1
Severity: wishlist
Tags: patch FTBFS
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

When I added loongarch64 support for rust-libseccomp and built locally, 
I found rust-libseccomp-sys source package lacks LoongArch architecture 
support.
The error log can be found as follows,
```
error[E0425]: cannot find value `SCMP_ARCH_LOONGARCH64` in this scope
    --> src/arch.rs:67:34
     |
67  |             Self::Loongarch64 => SCMP_ARCH_LOONGARCH64,
     |                                  ^^^^^^^^^^^^^^^^^^^^^ help: a 
constant with a similar name exists: `SCMP_ARCH_AARCH64`
     |
    ::: /usr/share/cargo/registry/libseccomp-sys-0.2.1/src/lib.rs:211:1
     |
211 | pub const SCMP_ARCH_AARCH64: u32 = 0xc00000b7;
     | -------------------------------- similarly named constant 
`SCMP_ARCH_AARCH64` defined here
```
We can check that 
/usr/share/cargo/registry/libseccomp-sys-0.2.1/src/lib.rs is provided by 
librust-libseccomp-sys-dev.
# dpkg -S /usr/share/cargo/registry/libseccomp-sys-0.2.1/src/lib.rs
librust-libseccomp-sys-dev:loong64: 
/usr/share/cargo/registry/libseccomp-sys-0.2.1/src/lib.rs

I have added loongarch64 support in rust-libseccomp-sys source package. 
And built successfully on my local ENV.
Please consider the patch I attached.
If you have any questions, you can contact me at any time.

thanks,
Dandan Zhang

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