When compiling without external signer support, the resulted `bench_bitcoin.exe` fails on Windows:
```
>.\bench_bitcoin.exe -filter=AddrManSelectByNetwork
Error: bad optional access
```

Steps to reproduce the failure:
- cross compiling on Ubuntu 22.04:
```
$ make -j $(nproc) -C depends HOST=x86_64-w64-mingw32 NO_QT=1
$ ./autogen.sh
$ ./configure CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site --disable-external-signer
$ make -j $(nproc)
```
- compiling natively on Windows:

Apply the diff as follows:
```diff
--- a/build_msvc/bitcoin_config.h.in
+++ b/build_msvc/bitcoin_config.h.in
@@ -41,9 +41,6 @@
 /* Define this symbol to enable ZMQ functions */
 #define ENABLE_ZMQ 1
 
-/* define if external signer support is enabled (requires Boost::Process) */
-#define ENABLE_EXTERNAL_SIGNER /**/
-
 /* Define to 1 if you have the declaration of `be16toh', and to 0 if you
    don't. */
 #define HAVE_DECL_BE16TOH 0
```
Then
```
>py -3 build_msvc\msvc-autogen.py
>msbuild build_msvc\bitcoin.sln -property:Configuration=Release -verbosity:minimal
>src\bench_bitcoin.exe -filter=AddrManSelectByNetwork
Error: bad optional access
```

---

The failure does not manifest itself when running `bench_bitcoin.exe` using Wine on Linux.
BOOST_CHECK(valid);
        BOOST_CHECK_EQUAL(text, expected_text);
    }
    {
        // r
        auto [valid, text] = ReadBinaryFile(tmpfile, expected_text.size() / 2);
        BOOST_CHECK(valid);
        BOOST_CHECK_EQUAL(text, expected_text.substr(0, expected_text.size() / 2));
    }
    {
        // r
        fs::path invalid_file = tmpfolder / "invalid_binary.dat";
        auto [valid, text] = ReadBinaryFile(invalid_file);
        BOOST_CHECK(!valid);
        BOOST_CHECK(text.empty());
    }
}
BOOST_AUTO_TEST_CASE(util_WriteBinaryFile)
{
    fs::path tmpfolder = m_args.GetDataDirBase();
    fs::path tmpfile = tmpfolder / "write_binary.dat";
    std::string expected_text = "bitcoin";
    auto valid = WriteBinaryFile(tmpfile, expected_text);
    std::string actual_text;
    std::ifstream file{tmpfile};
    file >> actual_text;
    BOOST_CHECK(valid);
    BOOST_CHECK_EQUAL(actual_text, expected_text);
}
BOOST_AUTO_TEST_CASE(clearshrink_test)