Fix build with Boost 1.77.0

BOOST_FILESYSTEM_C_STR changed to accept the path as an argument

src/fs.cpp

@@ -236,7 +236,11 @@ void ofstream::close()
 }
 #else // __GLIBCXX__
 
+#if BOOST_VERSION >= 107700
+static_assert(sizeof(*BOOST_FILESYSTEM_C_STR(fs::path())) == sizeof(wchar_t),
+#else
 static_assert(sizeof(*fs::path().BOOST_FILESYSTEM_C_STR) == sizeof(wchar_t),
+#endif // BOOST_VERSION >= 107700
     "Warning: This build is using boost::filesystem ofstream and ifstream "
     "implementations which will fail to open paths containing multibyte "
     "characters. You should delete this static_assert to ignore this warning, "

src/wallet/test/db_tests.cpp

@@ -18,7 +18,11 @@ BOOST_AUTO_TEST_CASE(getwalletenv_file)
     std::string test_name = "test_name.dat";
     const fs::path datadir = GetDataDir();
     fs::path file_path = datadir / test_name;
+#if BOOST_VERSION >= 107700
+    std::ofstream f(BOOST_FILESYSTEM_C_STR(file_path));
+#else
     std::ofstream f(file_path.BOOST_FILESYSTEM_C_STR);
+#endif // BOOST_VERSION >= 107700
     f.close();
 
     std::string filename;

src/wallet/test/init_test_fixture.cpp

@@ -31,7 +31,11 @@ InitWalletDirTestingSetup::InitWalletDirTestingSetup(const std::string& chainNam
     fs::create_directories(m_walletdir_path_cases["default"]);
     fs::create_directories(m_walletdir_path_cases["custom"]);
     fs::create_directories(m_walletdir_path_cases["relative"]);
+#if BOOST_VERSION >= 107700
+    std::ofstream f(BOOST_FILESYSTEM_C_STR(m_walletdir_path_cases["file"]));
+#else
     std::ofstream f(m_walletdir_path_cases["file"].BOOST_FILESYSTEM_C_STR);
+#endif // BOOST_VERSION >= 107700
     f.close();
 }