Use CC and CXX variables to compile on native targets

This is needed to allow Coverity and scan-build runs.

enabled an automatic merge when the pipeline for 0f553edc succeeds

By Maxime Perrotin on 2020-07-28T09:34:51

merged

By Maxime Perrotin on 2020-07-28T09:41:42

mentioned in commit 29ee7241

By Maxime Perrotin on 2020-07-28T09:41:43