sdl12-compat: Removed a FIXME.

SDL Commits
1 
From 68986d1ec538a4a193cc3e1cd74155a6eb71a75a Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 28 Apr 2021 17:55:06 -0400
Subject: [PATCH] Removed a FIXME.

It's better to not leave this lock open, because we might need this in a
stable state elsewhere (for YUV overlay display, etc).
---
 src/SDL12_compat.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index c6dc363..f9b2817 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -3765,7 +3765,6 @@ PresentScreen(void)
         return;  /* oh well */
     }
 
-    FIXME("Maybe lock texture always, until present, if no conversion needed?");
     if (VideoConvertSurface20) {
         VideoConvertSurface20->pixels = pixels;
         VideoConvertSurface20->pitch = pitch;