[Pkg-rust-maintainers] Bug#1068690: rust-jemalloc-sys: FTBFS: add support for loongarch64

[zhangdandan]

Source: rust-jemalloc-sys
Version: 0.3.2-2
Severity: wishlist
Tags: ftbfs patch
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

Compiling the rust-jemalloc-sys failed for loong64 in the Debian Package 
Auto-Building environment.
The error log is as follows,
```
[jemalloc-sys 0.3.2] In file included from 
include/jemalloc/internal/size_classes.h:6,
[jemalloc-sys 0.3.2]                  from 
../jemalloc/include/jemalloc/internal/tcache_types.h:4,
[jemalloc-sys 0.3.2]                  from 
../jemalloc/include/jemalloc/internal/jemalloc_internal_includes.h:46,
[jemalloc-sys 0.3.2]                  from ../jemalloc/src/bin.c:2:
[jemalloc-sys 0.3.2] 
../jemalloc/include/jemalloc/internal/jemalloc_internal_types.h:114:6: 
error: #error "Unknown minimum alignment for architecture; specify via "
[jemalloc-sys 0.3.2]   114 | #    error "Unknown minimum alignment for 
architecture; specify via "
[jemalloc-sys 0.3.2]       |      ^~~~~
```
The Full log can be found at 
https://buildd.debian.org/status/logs.php?pkg=rust-jemalloc-sys&ver=0.3.2-2&arch=loong64.

I have added loongarch support in rust-jemalloc-sys package. Please 
consider the patch I attached.
In addition, the LoongArch architecture has been supported by jemalloc 
upstream, pelase see https://github.com/jemalloc/jemalloc.
Would it be possible to include the support for LoongArch in the next 
upload?
Your opinions are welcome.

Thanks,
Dandan Zhang
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