[dxgi] Fix reported VRAM size for 32-bit builds

src/dxgi/dxgi_adapter.cpp

@@ -155,6 +155,14 @@ namespace dxvk {
         sharedMemory += heap.size;
     }
     
+    #ifndef _WIN64
+    // The value returned by DXGI is a 32-bit value
+    // on 32-bit platforms, so we need to clamp it
+    VkDeviceSize maxMemory = 0xF0000000;
+    deviceMemory = std::min(deviceMemory, maxMemory);
+    sharedMemory = std::min(sharedMemory, maxMemory);
+    #endif
+    
     pDesc->VendorId               = deviceProp.vendorID;
     pDesc->DeviceId               = deviceProp.deviceID;
     pDesc->SubSysId               = 0;