yaml: Backport upstream patch to build against system libyaml

haskell-yaml (0.8.32-3) unstable; urgency=medium

  * Backport upstream patch to build against system libyaml

 -- Ilias Tsitsimpis <iliastsi@debian.org>  Tue, 23 Oct 2018 15:32:38 +0300

haskell-yaml (0.8.32-2) unstable; urgency=medium

  * Remove build dependency on libghc-text-dev (provided by ghc-8.4.3)

From ba216731cd5bf4264e9ad95d55616ff1a9edfac5 Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>

Date: Wed, 29 Aug 2018 12:31:04 +0200

Subject: [PATCH] Correctly declare libyaml dependency on system-libyaml flag.

Fixes

    stack build --extra-include-dirs ... --extra-lib-dirs ...

to set libyaml path being ignored.

Also fixes https://github.com/NixOS/cabal2nix/issues/372#issuecomment-416062945

---

 package.yaml | 25 ++++++++++++++-----------

 1 file changed, 14 insertions(+), 11 deletions(-)

Index: b/yaml.cabal

===================================================================

--- a/yaml.cabal

+++ b/yaml.cabal

@@ -113,6 +113,8 @@ library

         libyaml/reader.c

         libyaml/scanner.c

         libyaml/writer.c

+  else

+    extra-libraries: yaml

   if os(windows)

     cpp-options: -DWINDOWS

   default-language: Haskell2010

fix-system-libyaml