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.
const size_t num_outputs = det_rand.randrange(24) + 1;
        const CAmount fee = 100 * det_rand.randrange(30);
        const CAmount amount_per_output = (total_in - fee) / num_outputs;
        for (size_t n{0}; n < num_outputs; ++n) {
            CScript spk = CScript() << CScriptNum(num_transactions + n);
            mtx.vout.emplace_back(amount_per_output, spk);
        }
        CTransactionRef ptx = MakeTransactionRef(mtx);
        mempool_transactions.push_back(ptx);
        if (amount_per_output > 3000) {
            
            
            
            for (size_t n{0}; n < num_outputs; ++n) {
                unspent_prevouts.emplace_back(COutPoint(ptx->GetHash(), n), amount_per_output);
                std::swap(unspent_prevouts.back(), unspent_prevouts[det_rand.randrange(unspent_prevouts.size())]);
            }
        }
        if (submit) {
            LOCK2(cs_main, m_node.mempool->cs);
            LockPoints lp;
            m_node.mempool->addUnchecked(CTxMemPoolEntry(ptx, (total_in - num_outputs * amount_per_output),
                                                         0, 1, 0,
                                                         false, 4, lp));
        }
        --num_transactions;
    }
    return mempool_transactions;
}
void TestChain100Setup::MockMempoolMinFee(const CFeeRate& target_feerate)