I assume this is the failure?

```
/usr/bin/ld: ../libmir-test-assist.a(mmap_wrapper.cpp.o): in function 
`std::literals::string_literals::operator"" s[abi:cxx11](char const*, unsigned 
long)':
/usr/include/c++/14/bits/basic_string.h:4696:(.text+0x650): undefined reference 
to `std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >::basic_string(char const*, unsigned long, 
std::allocator<char> const&)'
/usr/bin/ld: /usr/include/c++/14/bits/basic_string.h:4696:(.text+0xa68): 
undefined reference to `std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >::basic_string(char const*, 
unsigned long, std::allocator<char> const&)'
collect2: error: ld returned 1 exit status
```

We also see that on the Mir PPA arm64 build: https://launchpad.net/~mir-
team/+archive/ubuntu/rc/+packages

This error (an undefined reference to `std::string::string(char const*,
unsigned long, std::allocator<char> const&)`) comes from a failure to
resolve one "standard library" function calling another "standard
library" function.

I'm not sure that Mir contributes to this failure (other than by calling
the first function). (I don't have an arm64 system to hand for
investigation, will try later...)

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https://bugs.launchpad.net/bugs/2099790

Title:
  [p-m] Mir FTBFS on arm64

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