Update SDL to 2.0.7

libs/SDL2/src/audio/arts/SDL_artsaudio.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -20,8 +20,8 @@
 */
 #include "../../SDL_internal.h"
 
-#ifndef _SDL_artscaudio_h
-#define _SDL_artscaudio_h
+#ifndef SDL_artsaudio_h_
+#define SDL_artsaudio_h_
 
 #include <artsc.h>
 
@@ -42,11 +42,12 @@ struct SDL_PrivateAudioData
     Uint8 *mixbuf;
     int mixlen;
 
-    /* Support for audio timing using a timer, in addition to select() */
+    /* Support for audio timing using a timer, in addition to SDL_IOReady() */
     float frame_ticks;
     float next_frame;
 };
 #define FUDGE_TICKS 10      /* The scheduler overhead ticks per frame */
 
-#endif /* _SDL_artscaudio_h */
+#endif /* SDL_artsaudio_h_ */
+
 /* vi: set ts=4 sw=4 expandtab: */