Bump build platform and fix GCC9 warnings

OpenEtherCATsociety / SOES

Simple Open Source EtherCAT Slave

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Bump build platform and fix GCC9 warnings #106

Closed hefloryd closed 2 years ago

hefloryd commented 2 years ago

This PR changes the build platform to ubuntu 20.04 instead of the deprecated ubuntu 16.04, and fixes some warnings issued by the newer GCC version in ubuntu 20.04.