Use "%ld" instead of "%d" to format long values, using "%d" results in an
assert failure under LP64 systems as int and long have different sizes there.
Closes#14311.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71469 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775