kill C99'ism in SDL_waylandvulkan.c

src/video/wayland/SDL_waylandvulkan.c

@@ -39,7 +39,7 @@
 int Wayland_Vulkan_LoadLibrary(_THIS, const char *path)
 {
     VkExtensionProperties *extensions = NULL;
-    Uint32 extensionCount = 0;
+    Uint32 i, extensionCount = 0;
     SDL_bool hasSurfaceExtension = SDL_FALSE;
     SDL_bool hasWaylandSurfaceExtension = SDL_FALSE;
     PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr = NULL;
@@ -71,7 +71,7 @@ int Wayland_Vulkan_LoadLibrary(_THIS, const char *path)
         &extensionCount);
     if(!extensions)
         goto fail;
-    for(Uint32 i = 0; i < extensionCount; i++)
+    for(i = 0; i < extensionCount; i++)
     {
         if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
             hasSurfaceExtension = SDL_TRUE;