Remove `safecopy` from expected test failures.
Remove `safecopy` from expected test failures.

https://github.com/acid-state/safecopy/issues/45#issuecomment-258045406

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