Update SDL to version 2.0.14.

libs/SDL2/src/SDL_error_c.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2020 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
@@ -28,33 +28,11 @@
 #define SDL_error_c_h_
 
 #define ERR_MAX_STRLEN  128
-#define ERR_MAX_ARGS    5
 
 typedef struct SDL_error
 {
-    /* This is a numeric value corresponding to the current error */
-    int error;
-
-    /* This is a key used to index into a language hashtable containing
-       internationalized versions of the SDL error messages.  If the key
-       is not in the hashtable, or no hashtable is available, the key is
-       used directly as an error message format string.
-     */
-    char key[ERR_MAX_STRLEN];
-
-    /* These are the arguments for the error functions */
-    int argc;
-    union
-    {
-        void *value_ptr;
-#if 0                           /* What is a character anyway?  (UNICODE issues) */
-        unsigned char value_c;
-#endif
-        int value_i;
-        long value_l;
-        double value_f;
-        char buf[ERR_MAX_STRLEN];
-    } args[ERR_MAX_ARGS];
+    int error; /* This is a numeric value corresponding to the current error */
+    char str[ERR_MAX_STRLEN];
 } SDL_error;
 
 /* Defined in SDL_thread.c */