Fixed issues building 64-bit Windows binary

src/stdlib/SDL_stdlib.c

@@ -28,7 +28,7 @@
 #ifndef HAVE_LIBC
 /* These are some C runtime intrinsics that need to be defined */
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && !defined(_WIN64)
 
 #ifndef __FLTUSED__
 #define __FLTUSED__
@@ -40,7 +40,9 @@ __declspec(selectany)
 #endif
 
 /* Float to long */
-     void __declspec(naked) _ftol()
+void
+__declspec(naked)
+_ftol()
 {
     /* *INDENT-OFF* */
     __asm {

src/stdlib/SDL_string.c

@@ -1342,7 +1342,7 @@ SDL_vsnprintf(char *text, size_t maxlen, const char *fmt, va_list ap)
     }
     *text = '\0';
 
-    return (text - textstart);
+    return (int)(text - textstart);
 }
 #endif
 /* vi: set ts=4 sw=4 expandtab: */