Changes to allow wxPython to be built on *nix with wxWindows ports

besides wxGTK.  wxGTK2 (ANSI) currently works, others will be coming


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18473 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/my_distutils.py

@@ -444,6 +444,9 @@ def run_swig(files, dir, gendir, package, USE_SWIG, force, swig_args, swig_deps=
     from distutils.dep_util import newer
     from distutils.spawn import spawn
 
+    if not os.path.exists(os.path.join(dir, gendir)):
+        os.mkdir(os.path.join(dir, gendir))
+
     sources = []
 
     for file in files: