SDL: Fixed building with GameInput v1.0

From 0ee0fe157218476ff39d2213d726d260b6468f7d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 24 Jul 2025 10:42:28 -0700
Subject: [PATCH] Fixed building with GameInput v1.0

---
 src/joystick/gdk/SDL_gameinputjoystick.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/joystick/gdk/SDL_gameinputjoystick.cpp b/src/joystick/gdk/SDL_gameinputjoystick.cpp
index bf1d5ef4b6a9e..96f0daea592b5 100644
--- a/src/joystick/gdk/SDL_gameinputjoystick.cpp
+++ b/src/joystick/gdk/SDL_gameinputjoystick.cpp
@@ -173,7 +173,11 @@ static bool GAMEINPUT_InternalAddOrFind(IGameInputDevice *pDevice)
     elem->guid = SDL_CreateJoystickGUID(bus, vendor, product, version, manufacturer_string, product_string, 'g', 0);
     elem->device_instance = SDL_GetNextObjectID();
     elem->info = info;
+#if GAMEINPUT_API_VERSION >= 1
     elem->steam_virtual_gamepad_slot = GetSteamVirtualGamepadSlot(info->pnpPath);
+#else
+    elem->steam_virtual_gamepad_slot = -1;
+#endif
 
     g_GameInputList.devices = devicelist;
     g_GameInputList.devices[g_GameInputList.count++] = elem;