Cherry-pick of "Merge branch 'update-lhapdf' into 'master'" into 1.0

Attila Krasznahorkayrequested to merge
cherry-pick-66cc70d8 into 1.0

Add Lhapdf to package_filters for AthDerivationExternals

See merge request !115 (merged)

@jcatmore, in the future you'll probably want to set up merge request into this branch first. Since this is the one that we actually use for the AthDerivation build. 😉

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