Ruby 2.2.6 fails to install on xcode8

[malept]

When I run rvm install 2.2.6, homebrew automatically updates readline to 7.0, but Ruby 2.2.6 is built with readline 6.0:

Libraries missing for ruby-2.2.6: /usr/local/opt/readline/lib/libreadline.6.dylib. Refer to your system manual for installing libraries

Log: https://travis-ci.org/malept/thermite/jobs/190161964#L625

This doesn't happen with 2.2.5 because it's already on the image.

[BanzaiMan]

I think this is a variation of travis-ci/travis-rubies#26, where the newer binary archives on the Mac are not statically linked.

[stale]

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