Remove glFlush from SDL2 apps

recipes/neverball/redox.patch

@@ -73,15 +73,3 @@ diff -ruwN source/Makefile source-new/Makefile
  
  $(BALL_TARG) : $(BALL_OBJS)
  	$(LINK) -o $(BALL_TARG) $(BALL_OBJS) $(LDFLAGS) $(ALL_LIBS)
-diff -ruwN source/share/video.c source-new/share/video.c
---- source/share/video.c	2014-05-21 07:21:43.000000000 -0600
-+++ source-new/share/video.c	2019-08-09 21:41:42.891178826 -0600
-@@ -359,6 +359,8 @@
- 
-     snapshot_take();
- 
-+    glFlush();
-+
-     SDL_GL_SwapWindow(window);
- 
-     /* Accumulate time passed and frames rendered. */

recipes/sdl2_gears/gears.c

@@ -203,8 +203,6 @@ idle(void)
 
     draw();
 
-    glFlush();
-
     SDL_GL_SwapWindow(window);
 }
 
@@ -522,4 +520,4 @@ int main(int argc, char *argv[])
     cleanup();
 
     return 0;
-}
+}