Attempt to fix buildbot build by creating the wx directory if it doesn't exist.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@69211 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

build.py

@@ -74,6 +74,10 @@ def main(args):
     cfg = Config(noWxConfig=True)
     msg('')
 
+    wxpydir = os.path.join(phoenixDir(), "wx")
+    if not os.path.exists(wxpydir):
+        os.makedirs(wxpydir)
+
     if not args or 'help' in args or '--help' in args or '-h' in args:
         usage()
         sys.exit(1)