try no console window

bin/build-python

@@ -24,7 +24,7 @@ pyinstaller_args+="--hidden-import wx "
 
 # We need to use the precompiled bootloader linked with graphical Mac OS X
 # libraries if we develop a GUI application for Mac:
-if [ "$BUILD" = "osx" ]; then
+if [ "$BUILD" = "osx" -o "$BUILD" = "windows" ]; then
     pyinstaller_args+="--windowed "
 fi