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.
#include <thread>
#include <univalue.h>
#include <utility>
#include <vector>
#include <sys/types.h>
#ifndef WIN32
#include <signal.h>
#include <sys/wait.h>
#endif
#include <boost/test/unit_test.hpp>
using namespace std::literals;
static const std::string STRING_WITH_EMBEDDED_NULL_CHAR{"1"s "\0" "1"s};
namespace BCLog {
    std::string LogEscapeMessage(const std::string& str);
}
BOOST_FIXTURE_TEST_SUITE(util_tests, BasicTestingSetup)
namespace {
class NoCopyOrMove
{
public:
    int i;
    explicit NoCopyOrMove(int i) : i{i} { }
    NoCopyOrMove() = delete;
    NoCopyOrMove(const NoCopyOrMove&) = delete;
    NoCopyOrMove(NoCopyOrMove&&) = delete;
    NoCopyOrMove& operator=(const NoCopyOrMove&) = delete;
    NoCopyOrMove& operator=(NoCopyOrMove&&) = delete;
    operator bool() const { return i != 0; }
    int get_ip1() { return i + 1; }
    bool test()