[tlbuild] ttf2afm test failing on Mac OS X

[Henri Menke]

Dear list,

I realized that Travis CI on GitHub comes with XQuartz, so all the
required dependencies for building TeX Live are there.  Hence I added
another build job to the Travis configuration (https://git.io/fA4gH).
Amazingly, TeX Live builds on the first try!

Unfortunately though, one of the tests is failing.

FAIL: pdftexdir/ttf2afm.test

The reason I am writing to the list is that I don't have a Mac to
reproduce this issue locally.  I would appreciate any hints.
You can access the full build log here
https://api.travis-ci.org/v3/job/424165569/log.txt

Cheers, Henri