Remove sphinx dependency and don't build docs for old GHCs

Author: hamishmack

compiler/ghc/default.nix

@@ -141,9 +141,6 @@ let
     CrossCompilePrefix = ${targetPrefix}
   '' + lib.optionalString isCrossTarget ''
     Stage1Only = ${if targetPlatform.system == hostPlatform.system then "NO" else "YES"}
-  ''
-    # GHC 9.0.1 fails to compile for musl unless HADDOC_DOCS = NO
-    + lib.optionalString (isCrossTarget || (targetPlatform.isMusl && builtins.compareVersions ghc-version "9.0.1" >= 0)) ''
     HADDOCK_DOCS = NO
     BUILD_SPHINX_HTML = NO
     BUILD_SPHINX_PDF = NO
@@ -474,7 +471,7 @@ stdenv.mkDerivation (rec {
   dontAddExtraLibs = true;
 
   nativeBuildInputs = [
-    perl autoconf automake m4 python3 sphinx
+    perl autoconf automake m4 python3
     ghc bootPkgs.alex bootPkgs.happy bootPkgs.hscolour
   ] ++ lib.optional (patches != []) autoreconfHook;