Fix wxMSW build without PCH after recent wxListBox font fix.

This should have been part of r76671.

See #3577.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76677 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775