Add SDL_RenderDebugTextF & SDL_RenderDebugTextV

This should make it easier to quickly put important numbers and such on
the screen without having to format them into a string manually.

src/dynapi/SDL_dynapi.sym

@@ -1207,6 +1207,8 @@ SDL3_0.0.0 {
     SDL_SetGPUAllowedFramesInFlight;
     SDL_RenderTextureAffine;
     SDL_WaitAndAcquireGPUSwapchainTexture;
+    SDL_RenderDebugTextF;
+    SDL_RenderDebugTextV;
     # extra symbols go here (don't modify this line)
   local: *;
 };