[Opm] libecl update required

[Joakim Hove]

Tomorrow morning I intend to merge this PR: https://github.com/Statoil/libecl/pull/538 in libecl - that must/will be merged syncronously with this: https://github.com/OPM/opm-common/pull/575 in opm-common.


Joaim





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