Re-enable sdl2-* packages.
Re-enable sdl2-* packages.

Added external dependency in 50a89ebd5e7e420ed07c1c5f79424f3992fb9985.

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