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Replaces upstream SSheldon/rust-block#2, which makes GNUStep and WinObjC work with blocks. Kudos to @ngrewe for the original implementation (see also their explanation of the problem), I chose to not go the "autoconfigure" route since I wanted to pull in
objc2_sys
as a dependency when GNUStep support was requested (and this requires using features).In the end, this makes blocks work on GNUStep!