Bug#1132457: gasnet: FTBFS: Add loongarch64 support

[zhangdandan]

Source: gasnet
Version: 2025.8.0-5
Severity: normal
Tags: FTBFS patch
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

Compiling gasnet for loong64 has been failing in the Debian Package 
Auto-Building environment.
The error log is as follows,
```
......
In file included from 
/build/reproducible-path/gasnet-2025.8.0/gasnet_tools.h:91,
                  from 
/build/reproducible-path/gasnet-2025.8.0/gasnet_tools.c:26:
/build/reproducible-path/gasnet-2025.8.0/gasnet_membar.h:232:3: error: 
#error unknown CPU - dont know how to do a local memory barrier for your 
CPU/OS
   232 |  #error unknown CPU - dont know how to do a local memory 
barrier for your CPU/OS
       |   ^~~~~
In file included from 
/build/reproducible-path/gasnet-2025.8.0/gasnet_tools.h:93:
/build/reproducible-path/gasnet-2025.8.0/gasnet_atomicops.h: In function 
‘gasneti_genatomic32_set’:
/build/reproducible-path/gasnet-2025.8.0/gasnet_atomicops.h:99:81: 
error: implicit declaration of function ‘gasneti_local_wmb’; did you 
mean ‘gasneti_local_mb’? [-Wimplicit-function-declaration]
    99 |                                                 if (f & 
GASNETI_ATOMIC_WMB_PRE) gasneti_local_wmb();
       |
^~~~~~~~~~~~~~~~~
......
```
After analyzing, we need to add loongarch64 support for gasnet.
Please consider the patch attached.
Based attached patch, I have built  gasnet successfully on loong64.
```
dpkg-deb: building package 'libgasnet-dev' in 
'../libgasnet-dev_2025.8.0-5.1_loong64.deb'.
dpkg-deb: building package 'gasnet' in '../gasnet_2025.8.0-5.1_loong64.deb'.
dpkg-deb: building package 'gasnet-dbgsym' in 
'../gasnet-dbgsym_2025.8.0-5.1_loong64.deb'.
  dpkg-genbuildinfo -O../gasnet_2025.8.0-5.1_loong64.buildinfo
  dpkg-genchanges -O../gasnet_2025.8.0-5.1_loong64.changes
dpkg-genchanges: info: not including original source code in upload
  dpkg-source --after-build .
dpkg-buildpackage: info: binary and diff upload (original source NOT 
included)
  signfile gasnet_2025.8.0-5.1.dsc
```

I was unable to locate where to submit a pull request upstream.
If someone knows where to submit the pull request, they can help 
contribute the patch upstream.

Best regards,
Dandan Zhang

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