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_EQUAL(result.size(), 1);
        BOOST_CHECK_EQUAL(result[0], "abc");
    }
    
    {
        std::vector<std::string> result = SplitString("a-b", '-');
        BOOST_CHECK_EQUAL(result.size(), 2);
        BOOST_CHECK_EQUAL(result[0], "a");
        BOOST_CHECK_EQUAL(result[1], "b");
    }
    
    {
        std::vector<std::string> result = SplitString("AAA", 'a');
        BOOST_CHECK_EQUAL(result.size(), 1);
        BOOST_CHECK_EQUAL(result[0], "AAA");
    }
    
    {
        using V = std::vector<std::string>;
        BOOST_TEST(SplitString("a,b.c:d;e", ",;") == V({"a", "b.c:d", "e"}));
        BOOST_TEST(SplitString("a,b.c:d;e", ",;:.") == V({"a", "b", "c", "d", "e"}));
        BOOST_TEST(SplitString("a,b.c:d;e", "") == V({"a,b.c:d;e"}));
        BOOST_TEST(SplitString("aaa", "bcdefg") == V({"aaa"}));
        BOOST_TEST(SplitString("x\0a,b"s, "\0"s) == V({"x", "a,b"}));
        BOOST_TEST(SplitString("x\0a,b"s, '\0') == V({"x", "a,b"}));
        BOOST_TEST(SplitString("x\0a,b"s, "\0,"s) == V({"x", "a", "b"}));
        BOOST_TEST(SplitString("abcdefg", "bcd") == V({"a", "", "", "efg"}));
    }
}
BOOST_AUTO_TEST_CASE(test_LogEscapeMessage)