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From: Anthony Green <green@moxielogic.com>
Date: Mon, 9 Mar 2020 15:11:20 -0400
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Subject: libffi PR builds on travis-ci
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libffi pull request builds on travis-ci have been failing for a while, but
now they are fixed.

At issue was the use of a travis-ci secret environment variable used as API
keys for https://rl.gl.   As it happens, travis-ci doesn't allow the use of
these secret values in pull request builds -- only in the master and
feature branch builds.  And so I implemented something called "policy bound
API keys" in rlgl.  A policy bound API key is a key that can only be used
with a specific policy.  So,  in this case, I've bound
0LIBFFI-0LIBFFI-0LIBFFI-0LIBFFI to https://github.com/libffi/rlgl-policy.git.
This API key can be shared publicly, so now it is hard-coded in the
travis-ci build/test scripts, and used for every build.

The bottom line is that PR travis-ci tests are working again!

AG