don't stop rendering frames after load state

README.txt

 ------------------------------------------------------------------------------
 Stuff that currently doesn't work:
 
-* Savestates
 * Some games don't work
 
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libretro/libretro.cpp

@@ -366,6 +366,7 @@ static void report_buttons (void)
 
 void retro_run (void)
 {
+   IPPU.RenderThisFrame = TRUE;
    S9xMainLoop();
    S9xMixSamples(audio_buf, avail * 2);
    audio_batch_cb((int16_t *) audio_buf, avail);