ghc-8.4.4: use sphinx 1.7.x to build the documentation

ghc-8.4.4 requires sphinx < 1.8, otherwise build fails on haddock with:

    Extension error: The 'ghc-flag' directive is already registered to domain std

Also fixed evaluation errors in configurations of ghc-8.2.x and ghc-8.4.x.

Closes #55703.

pkgs/development/haskell-modules/configuration-ghc-8.2.x.nix

@@ -20,6 +20,7 @@ self: super: {
   ghc-boot = null;
   ghc-boot-th = null;
   ghc-compact = null;
+  ghc-heap = null;
   ghc-prim = null;
   ghci = null;
   haskeline = null;
@@ -42,11 +43,6 @@ self: super: {
   stm = self.stm_2_5_0_0;
   text = self.text_1_2_3_1;
 
-  # Make sure we can still build Cabal 1.x.
-  Cabal_1_24_2_0 = overrideCabal super.Cabal_1_24_2_0 (drv: {
-    prePatch = "sed -i -e 's/process.*< 1.5,/process,/g' Cabal.cabal";
-  });
-
   # Build with the latest Cabal version, which works best albeit not perfectly.
   jailbreak-cabal = super.jailbreak-cabal.override { Cabal = self.Cabal_2_2_0_1; };
 
@@ -89,7 +85,6 @@ self: super: {
   cabal2nix = super.cabal2nix.overrideScope (self: super: { Cabal = self.Cabal_2_2_0_1; });
   cabal2spec = super.cabal2spec.overrideScope (self: super: { Cabal = self.Cabal_2_2_0_1; });
   distribution-nixpkgs = super.distribution-nixpkgs.overrideScope (self: super: { Cabal = self.Cabal_2_2_0_1; });
-  hackage-db_2_0_1 = super.hackage-db_2_0_1.overrideScope (self: super: { Cabal = self.Cabal_2_2_0_1; });
   stack = super.stack.overrideScope (self: super: { Cabal = self.Cabal_2_2_0_1; });
 
   # Older GHC versions need these additional dependencies.

pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix

@@ -20,6 +20,7 @@ self: super: {
   ghc-boot = null;
   ghc-boot-th = null;
   ghc-compact = null;
+  ghc-heap = null;
   ghc-prim = null;
   ghci = null;
   haskeline = null;
@@ -63,13 +64,9 @@ self: super: {
   # more verbose but friendlier for Hydra.
   stack = (doJailbreak super.stack).override {
     Cabal = self.Cabal_2_4_1_0;
-    hpack = self.hpack_0_31_1.override { Cabal = self.Cabal_2_4_1_0; };
-    yaml = self.yaml_0_11_0_0;
+    hpack = self.hpack.override { Cabal = self.Cabal_2_4_1_0; };
     hackage-security = self.hackage-security.override { Cabal = self.Cabal_2_4_1_0; };
   };
-  hpack_0_31_1 = super.hpack_0_31_1.override {
-    yaml = self.yaml_0_11_0_0;
-  };
 
   # Older GHC versions need these additional dependencies.
   aeson = addBuildDepend super.aeson self.contravariant;

pkgs/top-level/haskell-packages.nix

@@ -55,7 +55,7 @@ in {
     };
     ghc844 = callPackage ../development/compilers/ghc/8.4.4.nix {
       bootPkgs = packages.ghc822Binary;
-      sphinx = null;            # broken with sphinx 1.8.x
+      sphinx = buildPackages.python3Packages.sphinx_1_7_9;
       buildLlvmPackages = buildPackages.llvmPackages_5;
       llvmPackages = pkgs.llvmPackages_5;
     };

pkgs/top-level/python-packages.nix

@@ -4130,6 +4130,15 @@ in {
 
   sphinx = callPackage ../development/python-modules/sphinx { };
 
+  sphinx_1_7_9 = (callPackage ../development/python-modules/sphinx { })
+    .overridePythonAttrs (oldAttrs: rec {
+      version = "1.7.9";
+      src = oldAttrs.src.override {
+        inherit version;
+        sha256 = "217a7705adcb573da5bbe1e0f5cab4fa0bd89fd9342c9159121746f593c2d5a4";
+      };
+    });
+
   sphinx-argparse = callPackage ../development/python-modules/sphinx-argparse { };
 
   sphinxcontrib-websupport = callPackage ../development/python-modules/sphinxcontrib-websupport { };