This was erroneously removed by e82c619402 but
it still needs to be defined here, even if it's not used under macOS, in order
to avoid errors about it being undefined in wx/unix/chkconf.h.
This was erroneously removed by e82c619402 but
it still needs to be defined here, even if it's not used under macOS, in order
to avoid errors about it being undefined in wx/unix/chkconf.h.