SDL_config_windows.h: define HAVE_TRUNC[F] for Visual Studio >= 2013

include/SDL_config_windows.h

@@ -166,8 +166,6 @@ typedef unsigned int uintptr_t;
 #define HAVE_SQRTF  1
 #define HAVE_TAN    1
 #define HAVE_TANF   1
-#define HAVE_TRUNC  1
-#define HAVE_TRUNCF 1
 #if defined(_MSC_VER)
 /* These functions were added with the VC++ 2013 C runtime library */
 #if _MSC_VER >= 1800
@@ -175,6 +173,8 @@ typedef unsigned int uintptr_t;
 #define HAVE_VSSCANF 1
 #define HAVE_SCALBN 1
 #define HAVE_SCALBNF 1
+#define HAVE_TRUNC  1
+#define HAVE_TRUNCF 1
 #endif
 /* This function is available with at least the VC++ 2008 C runtime library */
 #if _MSC_VER >= 1400