This identifier wasn't used anywhere as WXUNUSED() is always defined as nothing for all compilers since quite some time. Also moved wxUSE_IOSTREAMH together with the other wxUSE_STD_XXX options and removed the "compiler (mis)features" section which became empty after doing this. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67347 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775