This is important not only for consistency with the other platforms but also because without SIZEOF_LONG_LONG being defined, "%lu" format specifier can't be used with size_t values under Win64, as Arg_Size_t is not defined correctly there if SIZEOF_LONG_LONG is unknown. Closes #15670. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75212 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775