Peter Trommler authored Nov 15, 2017 and Ben Gamari committed Nov 15, 2017

The update of GHC's in-tree libffi causes warnings about
undefined macros and hence validate fails.

Also mark broken tests that have a ticket.

Fixes #14353

Test Plan: ./validate (on AIX and powerpc if possible)

Reviewers: bgamari, hvr, erikd, simonmar

Reviewed By: bgamari

Subscribers: snowleopard, rwbarton, thomie

GHC Trac Issues: #14353, #11259, #14455, #11261

Differential Revision: https://phabricator.haskell.org/D4181