CI: clang installation broken in current Travis build images

From: John Maddock (jz.maddock_at_[hidden])
Date: 2019-06-16 15:39:16

Currently, pretty much all attempts at installing clang on the travis 
build images is failing: 
https://travis-ci.org/boostorg/config/builds/546084433?utm_source=github_status&utm_medium=notification. 
And since all the boost libraries have pretty much copied each others 
.travis.yml files, this means that most PR's for most libraries will be 
failing.

Anyone any ideas?

Thanks, John.

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