Remove -Wno-incomplete-uni-patterns

[philderbeast]

Removes all uses of -Wno-incomplete-uni-patterns except the one remaining in cabal-install-solver with lazy pattern matching that seems a bit hairy, as shown below:

cabal/cabal-install-solver/src/Distribution/Solver/Modular/Linking.hs

Lines 4 to 5 in 8974189

	-- TODO: remove this
	{-# OPTIONS -Wno-incomplete-uni-patterns #-}

cabal/cabal-install-solver/src/Distribution/Solver/Modular/Linking.hs

Lines 249 to 274 in 8974189

	go1 :: FlaggedDep QPN -> FlaggedDep QPN -> UpdateState ()
	go1 dep rdep = case (dep, rdep) of
	(Simple (LDep dr1 (Dep (PkgComponent qpn _) _)) _, ~(Simple (LDep dr2 (Dep (PkgComponent qpn' _) _)) _)) -> do
	vs <- get
	let lg = M.findWithDefault (lgSingleton qpn Nothing) qpn $ vsLinks vs
	lg' = M.findWithDefault (lgSingleton qpn' Nothing) qpn' $ vsLinks vs
	lg'' <- lift' $ lgMerge ((CS.union `on` dependencyReasonToConflictSet) dr1 dr2) lg lg'
	updateLinkGroup lg''
	(Flagged fn _ t f, ~(Flagged _ _ t' f')) -> do
	vs <- get
	case M.lookup fn (vsFlags vs) of
	Nothing -> return () -- flag assignment not yet known
	Just True -> go t t'
	Just False -> go f f'
	(Stanza sn t, ~(Stanza _ t')) -> do
	vs <- get
	case M.lookup sn (vsStanzas vs) of
	Nothing -> return () -- stanza assignment not yet known
	Just True -> go t t'
	Just False -> return () -- stanza not enabled; no new deps
	-- For extensions and language dependencies, there is nothing to do.
	-- No choice is involved, just checking, so there is nothing to link.
	-- The same goes for pkg-config constraints.
	(Simple (LDep _ (Ext _)) _, _) -> return ()
	(Simple (LDep _ (Lang _)) _, _) -> return ()
	(Simple (LDep _ (Pkg _ _)) _, _) -> return ()

---

• Patches conform to the coding conventions.
• Is this a PR that fixes CI? If so, it will need to be backported to older cabal release branches (ask maintainers for directions).

[ulysses4ever]

Thanks!

Any chance you could squash the commit history?