Removed SDL_round() because the license wasn't compatible with zlib

src/stdlib/SDL_stdlib.c

@@ -169,16 +169,6 @@ SDL_pow(double x, double y)
 #endif /* HAVE_POW */
 }
 
-double
-SDL_round(double x)
-{
-#if defined(HAVE_ROUND)
-    return round(x);
-#else
-    return SDL_uclibc_round(x);
-#endif /* HAVE_ROUND */
-}
-
 double
 SDL_scalbn(double x, int n)
 {