Upgrade macOS cxx standard to c++17
Upgrade macOS cxx standard to c++17

Summary: configure: Upgrade macOS cxx standard to c++17

Test Plan: Check build server for errors

Reviewers: tobias

Reviewed By: tobias

Subscribers: #openmha

Maniphest Tasks: T929

Differential Revision: https://dev.openmha.org/D322

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