don't include headers which were excluded for wxGTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@17202 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

distrib/msw/tmake/gtk.t

@@ -80,6 +80,8 @@
     }
 
     foreach $file (sort keys %wxGENERICINCLUDE) {
+        next if $wxGENERICINCLUDE{$file} =~ /\bNotGTK\b/;
+
         $project{"GTK_HEADERS"} .= "generic/" . $file . " "
     }