A few fixes to make it compile under windows again

luprex/core/cpp/driver-mingw.cpp

@@ -41,7 +41,7 @@ static void set_nonblocking(SOCKET sock) {
 }
 
 static std::string winsock_error_string(int errcode) {
-    drv::ostringstream oss;
+    std::ostringstream oss;
     oss << "error " << errcode;
     return oss.str();
 }
@@ -51,7 +51,7 @@ static PADDRINFOA find_good_addr(PADDRINFOA addrinfo) {
         if (addr->ai_family == AF_INET) {
             return addr;
         }
-    }std::string
+    }
     return nullptr;
 }
 
@@ -59,10 +59,10 @@ static SOCKET open_connection(std::string_view target, std::string &err) {
     PADDRINFOA addrs = nullptr;
     PADDRINFOA goodaddr = nullptr;
     SOCKET sock = INVALID_SOCKET;
-    std::string_view host, port;
+    std::string host, port;
     
     err.clear();
-    util::split_host_port(target, host, port);
+    drv::split_host_port(target, host, port);
     int status = getaddrinfo(host.data(), port.data(), nullptr, &addrs);
     while (status == WSATRY_AGAIN) {
         status = getaddrinfo(host.data(), port.data(), nullptr, &addrs);