[boost] [coroutine] Boost.Coroutine 1.0 Deprecation Warning

Subject: [boost] [coroutine] Boost.Coroutine 1.0 Deprecation Warning
From: Vinnie Falco (vinnie.falco_at_[hidden])
Date: 2018-12-11 13:32:47

Can we please turn off this deprecation warning for now? At least when
Boost.Coroutine is being included to work with Asio? I get neverending
complaints from users about this warning in Beast:

<https://travis-ci.org/vinniefalco/beast/jobs/466272022#L1091>

I am of course defining BOOST_COROUTINES_NO_DEPRECATION_WARNING:

<https://github.com/boostorg/beast/blob/010fb4b08c05ce82cf4a87d9985c5b4998d95733/Jamfile#L105>

But this warning happens when building the coroutine library not when
compiling Beast's tests and examples.

Regards