New comment by unspecd on void-packages repository

https://github.com/void-linux/void-packages/issues/27398#issuecomment-750871056

Comment:
Here is a minimal non-working example:
```c++
// regex.cpp
#include <boost/regex.hpp>
#include <boost/regex/icu.hpp>

int main()
{
    std::string str = "";
    auto expr = boost::make_u32regex(str);
    //std::string str_no_symbols = boost::u32regex_replace(str, expr, "");

    return 0;
}
```

```sh
$ $(xdistdir)/masterdir/bin/aarch64-linux-musl-g++ --sysroot=$(xdistdir)/masterdir/usr/aarch64-linux-musl -o regex regex.cpp -lboost_regex