RAWINPUT_InitWindowsGamingInput: change pNamespace from LPTSTR to PCWSTR

because WindowsCreateStringReference specifically accepts const WCHAR *
- WGI_JoystickInit(): ditto.

cf. bug #5435.

src/joystick/windows/SDL_rawinputjoystick.c

@@ -546,7 +546,7 @@ RAWINPUT_InitWindowsGamingInput(RAWINPUT_DeviceContext *ctx)
             WindowsCreateStringReference_t WindowsCreateStringReferenceFunc = (WindowsCreateStringReference_t)GetProcAddress(hModule, "WindowsCreateStringReference");
             RoGetActivationFactory_t RoGetActivationFactoryFunc = (RoGetActivationFactory_t)GetProcAddress(hModule, "RoGetActivationFactory");
             if (WindowsCreateStringReferenceFunc && RoGetActivationFactoryFunc) {
-                LPTSTR pNamespace = L"Windows.Gaming.Input.Gamepad";
+                PCWSTR pNamespace = L"Windows.Gaming.Input.Gamepad";
                 HSTRING_HEADER hNamespaceStringHeader;
                 HSTRING hNamespaceString;
 

src/joystick/windows/SDL_windows_gaming_input.c

@@ -372,7 +372,7 @@ WGI_JoystickInit(void)
         WindowsCreateStringReference_t WindowsCreateStringReferenceFunc = (WindowsCreateStringReference_t)GetProcAddress(hModule, "WindowsCreateStringReference");
         RoGetActivationFactory_t RoGetActivationFactoryFunc = (RoGetActivationFactory_t)GetProcAddress(hModule, "RoGetActivationFactory");
         if (WindowsCreateStringReferenceFunc && RoGetActivationFactoryFunc) {
-            LPTSTR pNamespace;
+            PCWSTR pNamespace;
             HSTRING_HEADER hNamespaceStringHeader;
             HSTRING hNamespaceString;