Give spelling suggestions in :set

:set could give the same suggestions as command-line flags:

$ ghci -XCUSKS
GHCi, version 9.6.1: https://www.haskell.org/ghc/  :? for help
ghc-9.6.1: unrecognised flag: -XCUSKS
did you mean one of:
  -XCUSKs

Usage: For basic information, try the `--help' option.

$ ghci
GHCi, version 9.6.1: https://www.haskell.org/ghc/  :? for help
ghci> :set -XCUSKS
Some flags have not been recognized: -XCUSKS
ghci>

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