Handle GHC 9 changes in a backwards compatible manner.

Taken from upstream:

  https://github.com/ganeti/ganeti/commit/b279fa738fd5b30320584f79f4d2f0e894315aab

diff --git a/src/Ganeti/THH.hs b/src/Ganeti/THH.hs
index 818c11f84..9ab93d5e3 100644
--- a/src/Ganeti/THH.hs
+++ b/src/Ganeti/THH.hs
@@ -884,7 +884,7 @@ genLoadOpCode opdefs fn = do
                   ) $ zip mexps opdefs
       defmatch = Match WildP (NormalB fails) []
       cst = NoBindS $ CaseE (VarE opid) $ mpats++[defmatch]
-      body = DoE [st, cst]
+      body = mkDoE [st, cst]
   -- include "OP_ID" to the list of used keys
   bodyAndOpId <- [| $(return body)
                     <* tell (mkUsedKeys . S.singleton . T.pack $ opidKey) |]
@@ -1541,7 +1541,7 @@ loadExcConstructor inname sname fields = do
                 [x] -> BindS (ListP [VarP x])
                 _   -> BindS (TupP (map VarP f_names))
       cval = appCons name $ map VarE f_names
-  return $ DoE [binds read_args, NoBindS (AppE (VarE 'return) cval)]
+  return $ mkDoE [binds read_args, NoBindS (AppE (VarE 'return) cval)]
 
 {-| Generates the loadException function.
 
diff --git a/src/Ganeti/THH/Compat.hs b/src/Ganeti/THH/Compat.hs
index d29e30d18..1f51e49d7 100644
--- a/src/Ganeti/THH/Compat.hs
+++ b/src/Ganeti/THH/Compat.hs
@@ -40,9 +40,11 @@ module Ganeti.THH.Compat
   , extractDataDConstructors
   , myNotStrict
   , nonUnaryTupE
+  , mkDoE
   ) where
 
 import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
 
 -- | Convert Names to DerivClauses
 --
@@ -61,7 +63,11 @@ derivesFromNames names = map ConT names
 --
 -- Handle TH 2.11 and 2.12 changes in a transparent manner using the pre-2.11
 -- API.
+#if MIN_VERSION_template_haskell(2,17,0)
+gntDataD :: Cxt -> Name -> [TyVarBndr ()] -> [Con] -> [Name] -> Dec
+#else
 gntDataD :: Cxt -> Name -> [TyVarBndr] -> [Con] -> [Name] -> Dec
+#endif
 gntDataD x y z a b =
 #if MIN_VERSION_template_haskell(2,12,0)
     DataD x y z Nothing a $ derivesFromNames b
@@ -114,3 +120,12 @@ nonUnaryTupE es = TupE $ map Just es
 #else
 nonUnaryTupE es = TupE $ es
 #endif
+
+-- | DoE is now qualified with an optional ModName
+mkDoE :: [Stmt] -> Exp
+mkDoE s =
+#if MIN_VERSION_template_haskell(2,17,0)
+    DoE Nothing s
+#else
+    DoE s
+#endif
9d385c607b928d0d5a425331d36fea40ca'>packages</a>/<a href='/guix/log/gnu/packages/cryptsetup.scm?id=6a66709d385c607b928d0d5a425331d36fea40ca'>cryptsetup.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/cryptsetup.scm?id=6a66709d385c607b928d0d5a425331d36fea40ca&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-11-02 22:09:15 +0100'>2019-11-02</span></td><td><a href='/guix/commit/gnu/packages/cryptsetup.scm?id=7b25f8a45cfc89383ba1196f7388110afe12bf40'>gnu: cryptsetup: Update to 2.2.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cryptsetup.scm (cryptsetup): Update to 2.2.2.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-05 11:59:50 +0200'>2019-10-05</span></td><td><a href='/guix/commit/gnu/packages/cryptsetup.scm?id=c11caf2060d82c1dc56969ce3668ec9e6561fe79'>gnu: cryptsetup: Update to 2.2.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cryptsetup.scm (cryptsetup): Update to 2.2.1.
[arguments]: Add #:configure-flags.
[native-inputs]: Remove python &amp; add pkg-config.
[inputs]: Add argon2 &amp; json-c.
(cryptsetup-static): Disable new binaries.  Keep using libgcrypt.
Disable blkid support.
[inputs]: Add json-c.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-05 11:59:49 +0200'>2019-10-05</span></td><td><a href='/guix/commit/gnu/packages/cryptsetup.scm?id=b5c84b8a37aa268c370ad9c1cf335e5b6c1b3420'>gnu: cryptsetup-static: Don't build veritysetup.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cryptsetup.scm (cryptsetup-static)[arguments]: Pass
‘--disable-veritysetup’ #:configure-flag.  Adjust ‘remove-cruft’ phase.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-05 11:59:49 +0200'>2019-10-05</span></td><td><a href='/guix/commit/gnu/packages/cryptsetup.scm?id=d5e445e1d5b1db458f679f9c37acaf87b922b6cb'>gnu: cryptsetup: Don't use NAME in source URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cryptsetup.scm (cryptsetup)[source]: Hard-code NAME.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>