SCons updates

* Removed the I18N_DEFINES from the config.opts file. This define is not a
  user setting. The defines depend on what options the user enables in the top
  of the config.opts file (USE_INTERNATIONAL).
* Moved the defines to the correct SConscript files.
  Only the relevant libraries now use these defines.
* Windows fix for the python settings. There were missing brackets [ and ] for
  these settings.

source/blender/blenkernel/SConscript

@@ -58,4 +58,7 @@ blenkernel_env.Append (CPPPATH = ['.',
                                   '#/intern/iksolver/extern',
                                   '../blenloader'])
 
+if user_options_dict['USE_INTERNATIONAL'] == 1:
+    blenkernel_env.Append (CPPDEFINES = 'WITH_FREETYPE2')
+
 blenkernel_env.Library (target='#'+user_options_dict['BUILD_DIR']+'/lib/blender_blenkernel', source=source_files)