don't run povray export tests for now

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@1864 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/gfx/tests/CMakeLists.txt

@@ -4,9 +4,10 @@ set(OST_GFX_UNIT_TESTS
 )
 if (ENABLE_IMG)
   list(APPEND OST_GFX_UNIT_TESTS test_map_octree.cc)
-endif()
 
-ost_unittest(gfx "${OST_GFX_UNIT_TESTS}")
+	ost_unittest(gfx "${OST_GFX_UNIT_TESTS}")
+
+	target_link_libraries(gfx_tests ost_io)
+endif()
 
-target_link_libraries(gfx_tests ost_io)