Merge branch 'better-macos-support' into 'master'

Improve support for Extension building by acknowledging CXXFLAGS; Sets…

See merge request !95
3 jobs from master in 15 minutes and 14 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #153811
docker
build_linux_36

00:03:21

70.0%
passed #153812
macosx
build_macosx_36

00:14:47

70.0%
 
  Deploy
passed #153813
deployer
deploy_beta

00:00:27