cherry pick: Fix DV tests for gcc7. (AthContainers-00-03-16) (!24975) · Merge requests · atlas / athena · GitLab

Nils Erik Krumnack requested to merge krumnack/athena:data_vector_test_fix into 21.2 Jul 18, 2019

cherry picking this commit as @ssnyder thinks it may fix our nightly issues.

Tagging AthContainers-00-03-16.
- test/DataVector_test.icc: Fix test for gcc7.

Former-commit-id: 1898a734