ghc: Adding sphinx as build dependency to build man pages

Fixes https://github.com/NixOS/nixpkgs/issues/49627.
Closes https://github.com/NixOS/nixpkgs/pull/50920.

pkgs/development/compilers/ghc/8.4.4.nix

@@ -2,7 +2,7 @@
 
 # build-tools
 , bootPkgs
-, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4
+, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4, sphinx
 
 , libiconv ? null, ncurses
 
@@ -183,7 +183,7 @@ stdenv.mkDerivation (rec {
   strictDeps = true;
 
   nativeBuildInputs = [
-    perl autoconf automake m4 python3
+    perl autoconf automake m4 python3 sphinx
     ghc bootPkgs.alex bootPkgs.happy bootPkgs.hscolour
   ];
 

pkgs/development/compilers/ghc/8.6.1.nix

@@ -2,7 +2,7 @@
 
 # build-tools
 , bootPkgs
-, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4
+, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4, sphinx
 
 , libiconv ? null, ncurses
 
@@ -168,7 +168,7 @@ stdenv.mkDerivation (rec {
   strictDeps = true;
 
   nativeBuildInputs = [
-    perl autoconf automake m4 python3
+    perl autoconf automake m4 python3 sphinx
     ghc bootPkgs.alex bootPkgs.happy bootPkgs.hscolour
   ];
 

pkgs/development/compilers/ghc/8.6.2.nix

@@ -2,7 +2,7 @@
 
 # build-tools
 , bootPkgs
-, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4
+, autoconf, automake, coreutils, fetchurl, fetchpatch, perl, python3, m4, sphinx
 
 , libiconv ? null, ncurses
 
@@ -168,7 +168,7 @@ stdenv.mkDerivation (rec {
   strictDeps = true;
 
   nativeBuildInputs = [
-    perl autoconf automake m4 python3
+    perl autoconf automake m4 python3 sphinx
     ghc bootPkgs.alex bootPkgs.happy bootPkgs.hscolour
   ];
 

pkgs/development/compilers/ghc/head.nix

@@ -2,7 +2,7 @@
 
 # build-tools
 , bootPkgs
-, autoconf, automake, coreutils, fetchgit, perl, python3, m4
+, autoconf, automake, coreutils, fetchgit, perl, python3, m4, sphinx
 
 , libiconv ? null, ncurses
 

pkgs/top-level/haskell-packages.nix

@@ -52,21 +52,25 @@ in {
     };
     ghc844 = callPackage ../development/compilers/ghc/8.4.4.nix {
       bootPkgs = packages.ghc822Binary;
+      inherit (buildPackages.python3Packages) sphinx;
       buildLlvmPackages = buildPackages.llvmPackages_5;
       llvmPackages = pkgs.llvmPackages_5;
     };
     ghc861 = callPackage ../development/compilers/ghc/8.6.1.nix {
       bootPkgs = packages.ghc822;
+      inherit (buildPackages.python3Packages) sphinx;
       buildLlvmPackages = buildPackages.llvmPackages_6;
       llvmPackages = pkgs.llvmPackages_6;
     };
     ghc862 = callPackage ../development/compilers/ghc/8.6.2.nix {
       bootPkgs = packages.ghc822;
+      inherit (buildPackages.python3Packages) sphinx;
       buildLlvmPackages = buildPackages.llvmPackages_6;
       llvmPackages = pkgs.llvmPackages_6;
     };
     ghcHEAD = callPackage ../development/compilers/ghc/head.nix {
       bootPkgs = packages.ghc822Binary;
+      inherit (buildPackages.python3Packages) sphinx;
       buildLlvmPackages = buildPackages.llvmPackages_5;
       llvmPackages = pkgs.llvmPackages_5;
     };