minor fix for eigen3 check in SGObject_unittest
minor fix for eigen3 check in SGObject_unittest

karlnapf/shogun,karlnapf/shogun,lisitsyn/shogun,lambday/shogun,lisitsyn/shogun,shogun-toolbox/shogun,Saurabh7/shogun,geektoni/shogun,besser82/shogun,Saurabh7/shogun,Saurabh7/shogun,shogun-toolbox/shogun,lambday/shogun,karlnapf/shogun,karlnapf/shogun,geektoni/shogun,shogun-toolbox/shogun,karlnapf/shogun,besser82/shogun,sorig/shogun,sorig/shogun,sorig/shogun,Saurabh7/shogun,geektoni/shogun,Saurabh7/shogun,shogun-toolbox/shogun,lisitsyn/shogun,Saurabh7/shogun,sorig/shogun,lambday/shogun,Saurabh7/shogun,lisitsyn/shogun,Saurabh7/shogun,lisitsyn/shogun,shogun-toolbox/shogun,geektoni/shogun,besser82/shogun,sorig/shogun,lambday/shogun,geektoni/shogun,sorig/shogun,lambday/shogun,Saurabh7/shogun,shogun-toolbox/shogun,geektoni/shogun,besser82/shogun,besser82/shogun,karlnapf/shogun,besser82/shogun,lisitsyn/shogun,lambday/shogun