Bug#897707: arrayfire: ftbfs with GCC-8

[Bernhard Übelacker]

Hello,
just tried to have a look at #892288 but got stopped by this one.

Upstream handled this issue in [arrayfire/2148] and [arrayfire/2149].
Unfortunately this patch does not apply.

Also the pull request mentions another change is needed in the
boost library [boostorg/776].

Kind regards,
Bernhard


[arrayfire/2148] https://github.com/arrayfire/arrayfire/issues/2148
[arrayfire/2149] https://github.com/arrayfire/arrayfire/pull/2149
[boostorg/776]   https://github.com/boostorg/compute/pull/776