update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/test/testnative.c

@@ -32,6 +32,9 @@
#ifdef TEST_NATIVE_COCOA
    &CocoaWindowFactory,
#endif
#ifdef TEST_NATIVE_OS2
    &OS2WindowFactory,
#endif
    NULL
};
static NativeWindowFactory *factory = NULL;