remove build GUI stuff

[pgdr]

Fix the cause of this

ERROR: test_import_gui (tests.global.test_import_gui.ImportGUI)
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Traceback (most recent call last):
  File "/private/pgdr/statoil/libres/build/lib/python2.7/site-packages/tests/global/test_import_gui.py", line 26, in test_import_gui
    self.assertTrue( self.import_package( "ert_gui" ))
  File "/private/pgdr/statoil/libecl/build/install/lib/python2.7/site-packages/ecl/test/import_test_case.py", line 32, in import_package
    module = self.import_module( package )
  File "/private/pgdr/statoil/libecl/build/install/lib/python2.7/site-packages/ecl/test/import_test_case.py", line 28, in import_module
    mod = importlib.import_module( module )
  File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named ert_gui

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