https://bugs.winehq.org/show_bug.cgi?id=40490
--- Comment #5 from Henri Verbeet hverbeet@gmail.com --- (In reply to Sebastian Lackner from comment #4)
Wine Staging 1.9.6+ does no longer ship CSMT because the old patchset is no longer compatible. Developers are currently working on the integration of this feature into the development branch, and as part of that, a lot of parts have to be cleaned up and also be rewritten from scratch.
The number of developers working on integrating CSMT is a bit more limited than that statement sees to imply. I think it's also fair to point out that this is exactly the reason why the CSMT patch set wasn't integrated into Wine in its original form, and more generally why publishing a tree with patches you're not capable of/willing to maintain yourself is a bad idea.