Fix RDP host resolution failure on Windows: initialize Winsock

Every RDP connect attempt on Windows failed instantly with
ERRCONNECT_DNS_NAME_NOT_FOUND, even for a literal IP address. Root cause:
Winsock requires WSAStartup() to be called once by the process before any
socket/getaddrinfo call will succeed, and nothing in OrbitHub was calling
it (Qt Network isn't used, so Qt never does it either). FreeRDP's own
reference Windows client (wf_client.c) pairs WSAStartup with
freerdp_handle_signals() in its startup init for exactly this reason.
WinPR provides a portable no-op WSAStartup shim on POSIX, so this can be
called unconditionally cross-platform alongside the existing signal-handler
fix.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/rdp_session_backend.cpp

@@ -33,6 +33,7 @@
 #include <freerdp/scancode.h>
 #include <freerdp/settings.h>
 #include <freerdp/utils/signal.h>
+#include <winpr/winsock.h>
 #include <winpr/crt.h>
 #include <winpr/synch.h>
 #include <winpr/user.h>
@@ -41,19 +42,35 @@
 namespace {
 
 #ifdef ORBITHUB_HAS_FREERDP
-// Every reference FreeRDP client (X11, Windows, macOS, SDL, Wayland,
+// Mirrors wfreerdp_client_global_init() in FreeRDP's own reference Windows
-// Android) calls this once at startup before connecting. On Windows it's
+// client (client/Windows/wf_client.c): every reference client calls
-// the only place that initializes a global CRITICAL_SECTION used by
+// WSAStartup + freerdp_handle_signals once at startup before connecting.
-// freerdp_add_signal_cleanup_handler(); skipping it leaves that lock
+//
-// zero-initialized (invalid on Windows, tolerated on POSIX), so the first
+// WSAStartup: on Windows, sockets (getaddrinfo et al.) fail immediately
-// freerdp_connect() crashes with a null-pointer dereference inside
+// with WSANOTINITIALISED until this has been called by *someone* in the
-// EnterCriticalSection. Guarded so it only ever runs once.
+// process; OrbitHub never used Qt Network, so nothing else on Windows was
-void ensureFreeRdpSignalHandlersInitialized()
+// calling it, and every connect failed instantly with
+// ERRCONNECT_DNS_NAME_NOT_FOUND even for a literal IP address. WinPR
+// provides a portable no-op WSAStartup shim on POSIX, so this is safe to
+// call unconditionally cross-platform.
+//
+// freerdp_handle_signals: on Windows it's the only place that initializes
+// a global CRITICAL_SECTION used by freerdp_add_signal_cleanup_handler();
+// skipping it leaves that lock zero-initialized (invalid on Windows,
+// tolerated on POSIX), so the first freerdp_connect() crashed with a
+// null-pointer dereference inside EnterCriticalSection.
+//
+// Guarded so it only ever runs once.
+void ensureFreeRdpRuntimeInitialized()
 {
     static std::once_flag onceFlag;
     std::call_once(onceFlag, []() {
-        const int rc = freerdp_handle_signals();
+        WSADATA wsaData;
-        Q_UNUSED(rc);
+        const int wsaRc = WSAStartup(0x101, &wsaData);
+        Q_UNUSED(wsaRc);
+
+        const int signalRc = freerdp_handle_signals();
+        Q_UNUSED(signalRc);
     });
 }
 #endif
@@ -1493,7 +1510,7 @@ void RdpSessionBackend::workerMain()
     m_workerRunning.store(false);
     return;
 #else
-    ensureFreeRdpSignalHandlersInitialized();
+    ensureFreeRdpRuntimeInitialized();
 
     freerdp* instance = freerdp_new();
     if (instance == nullptr) {