[Bug 268327] graphics/mesa-dri: 22.3.0 breaks direct rendering (radeon, SUMO, r600_dri)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268327

--- Comment #42 from Florian Walpen <dev@submerge.ch> ---
(In reply to Felix Palmen from comment #40)

> Are you sure this is complete? Just asking because the upstream issue has a few other commits linked as well....

There were multiple attempts and some rebases, but AFAICT only this one commit
was merged.

And it fixes exactly the issue he identified: Deleting an entry from the C++
std::set that our iterator currently points to. This invalidates the iterator.
The fix is to increment the iterator before deletion, which is correct
according to specs, see

https://en.cppreference.com/w/cpp/container/set/erase

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