Update SDL to 2.0.7

libs/SDL2/include/SDL_version.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
@@ -25,8 +25,8 @@
  *  This header defines the current SDL version.
  */
 
-#ifndef _SDL_version_h
-#define _SDL_version_h
+#ifndef SDL_version_h_
+#define SDL_version_h_
 
 #include "SDL_stdinc.h"
 
@@ -59,7 +59,7 @@ typedef struct SDL_version
 */
 #define SDL_MAJOR_VERSION   2
 #define SDL_MINOR_VERSION   0
-#define SDL_PATCHLEVEL      5
+#define SDL_PATCHLEVEL      7
 
 /**
  *  \brief Macro to determine SDL version program was compiled against.
@@ -157,6 +157,6 @@ extern DECLSPEC int SDLCALL SDL_GetRevisionNumber(void);
 #endif
 #include "close_code.h"
 
-#endif /* _SDL_version_h */
+#endif /* SDL_version_h_ */
 
 /* vi: set ts=4 sw=4 expandtab: */