Mark dsp for expected haddock failure.
Mark dsp for expected haddock failure.

Please see https://github.com/fpco/stackage/issues/2563.

ygale/stackage,phaazon/stackage,fimad/stackage,mrkkrp/stackage,peti/stackage,stackbuilders/stackage,creichert/stackage,judah/stackage,jonschoning/stackage,ethercrow/stackage,Shimuuar/stackage,mgajda/stackage,soenkehahn/stackage,asr/stackage,lwm/stackage,spencerjanssen/stackage,massysett/stackage,michalkonecny/stackage,wereHamster/stackage,Daniel-Diaz/stackage,simonmichael/stackage,iand675/stackage,int-index/stackage,clinty/stackage,fpco/stackage,athanclark/stackage,alanz/stackage,GregorySchwartz/stackage,k0ral/stackage,garetxe/stackage,mstksg/stackage