[R-package] [ci] Fix CI timeouts for Mac builds on Travis (fixes #3091) #3092
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See #3091 for details. This PR fixes the recent issues with R Mac builds timing out on Travis.
It's not clear why these builds, which used to take around 10 minutes total, now take closer to 19 minutes
I'm a little worried that recent R PRs introduced a Mac installation performance problem, but I've also found (across many projects, not just LightGBM), that the Mac environments on Travis are not as reliable as the Linux environments.
Either way, that investigation can come later...this PR should unblock us.