Python: Do not export symbols

Nothing depends on this plugin, so these exports are not needed.

Change-Id: I7a6c1c6fd1dd355c904d2dcb6d3f0522cf30adcd
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/pythoneditor/pythoneditor.qbs

@@ -16,7 +16,6 @@ QtcPlugin {
         name: "General"
         files: [
             "pythoneditor.cpp", "pythoneditor.h",
-            "pythoneditor_global.h",
             "pythoneditorconstants.h",
             "pythoneditorfactory.cpp", "pythoneditorfactory.h",
             "pythoneditorplugin.cpp", "pythoneditorplugin.h",