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Advertised RTS ways is incorrect in at least 9.6.* and 9.8.* releases

[matt@nixos:~/ghcs-nix]$ ghc-9.8.2 --info | grep "RTS ways"
 ,("RTS ways","debug thr thr_debug thr_p dyn debug_dyn thr_dyn thr_debug_dyn thr_debug_p debug_p")

[matt@nixos:~/ghcs-nix]$ ghc-9.10.1 --info | grep "RTS ways"
 ,("RTS ways","v thr thr_debug thr_debug_p thr_debug_dyn thr_p thr_dyn debug debug_p debug_dyn p dyn")

Notice that the p flavour is not advertised on 9.8.2.

This was fixed in 6c043187

Not sure whether this is worth backporting or not.

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