haskellPackages: unbreak amazonka (and other packages that use it)

Closes https://github.com/NixOS/nixpkgs/pull/68944.

pkgs/development/haskell-modules/patches/amazonka-Allow-http-client-0.6.patch

@@ -0,0 +1,24 @@
+From 657b70d174fe5cb61e56cb8b9c5e57f1ec216f2b Mon Sep 17 00:00:00 2001
+From: Mikhail Glushenkov <mikhail.glushenkov@gmail.com>
+Date: Wed, 10 Apr 2019 17:42:57 +0100
+Subject: [PATCH] Allow http-client 0.6.*.
+
+Changelog doesn't list any silently breaking semantic changes.
+---
+ amazonka/amazonka.cabal  | 2 +-
+ core/amazonka-core.cabal | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/amazonka/amazonka.cabal b/amazonka/amazonka.cabal
+index e86713f11c..81c4cb7e48 100644
+--- a/amazonka.cabal
++++ b/amazonka.cabal
+@@ -67,7 +67,7 @@ library
+         , conduit-extra       >= 1.1
+         , directory           >= 1.2
+         , exceptions          >= 0.6
+-        , http-client         >= 0.4 && < 0.6
++        , http-client         >= 0.4 && < 0.7
+         , http-conduit        >= 2.1.7 && < 3
+         , http-types          >= 0.8
+         , ini                 >= 0.3.5