[Bug 2121946] [NEW] FTBFS: package ubiquity fails to build on riscv64 Questing

[Valentin HAUDIQUET]

Public bug reported:

ubiquity fails to build on riscv64 Ubuntu 25.10:
https://launchpad.net/ubuntu/+archive/test-rebuild-20250731-questing-rva23/+build/31049361

```
cc -c -W -Wall -Werror -Wno-format -DNDEBUG -DNETCFG_VERSION="\"1.171ubuntu1\"" -I. -DWIRELESS -DNM -Os -fomit-frame-pointer   -o static.o static.c
In file included from /usr/include/features.h:523,
                 from /usr/include/riscv64-linux-gnu/sys/types.h:25,
                 from netcfg.h:32,
                 from static.c:6:
In function ‘inet_ntop’,
    inlined from ‘netcfg_get_pointopoint’ at static.c:69:5,
    inlined from ‘netcfg_get_static’ at static.c:583:21:
/usr/include/riscv64-linux-gnu/bits/inet-fortified.h:36:10: error: call to ‘__inet_ntop_chk_warn’ declared with attribute warning: inet_ntop called with bigger length than size of destination buffer [-Werror=attribute-warning]
   36 |   return __glibc_fortify (inet_ntop, __dst_size, sizeof (char),
      |          ^~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
```

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2121946

Title:
  FTBFS: package ubiquity fails to build on riscv64 Questing

Status in ubiquity package in Ubuntu:
  New

Bug description:
  ubiquity fails to build on riscv64 Ubuntu 25.10:
  https://launchpad.net/ubuntu/+archive/test-rebuild-20250731-questing-rva23/+build/31049361

  ```
  cc -c -W -Wall -Werror -Wno-format -DNDEBUG -DNETCFG_VERSION="\"1.171ubuntu1\"" -I. -DWIRELESS -DNM -Os -fomit-frame-pointer   -o static.o static.c
  In file included from /usr/include/features.h:523,
                   from /usr/include/riscv64-linux-gnu/sys/types.h:25,
                   from netcfg.h:32,
                   from static.c:6:
  In function ‘inet_ntop’,
      inlined from ‘netcfg_get_pointopoint’ at static.c:69:5,
      inlined from ‘netcfg_get_static’ at static.c:583:21:
  /usr/include/riscv64-linux-gnu/bits/inet-fortified.h:36:10: error: call to ‘__inet_ntop_chk_warn’ declared with attribute warning: inet_ntop called with bigger length than size of destination buffer [-Werror=attribute-warning]
     36 |   return __glibc_fortify (inet_ntop, __dst_size, sizeof (char),
        |          ^~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors
  ```

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