Merge branch 'sg/ci-osx-gcc8-fix'

CI build fix. * sg/ci-osx-gcc8-fix: ci: fix GCC install in the Travis CI GCC OSX job

Junio C Hamano committed Oct 24, 2019 at 13:34 UTC 04b1f4f768bc36cc074a311b9c5e339a9fce160a

No changes.