kmymoney: Fix build with Qt 5.11

It's a really small fix that even could have been done via sed, but I'm
using the upstream patch instead so that once a new upstream release
comes along we don't forget to drop the patch.

The patch is from the upstream commit at:

https://cgit.kde.org/kmymoney.git/commit/?id=e5198a902996b27bf9abde0ad24af82d55ab5dc1

Signed-off-by: aszlig <aszlig@nix.build>

pkgs/applications/office/kmymoney/default.nix

@@ -1,4 +1,5 @@
 { stdenv, lib, fetchurl, doxygen, extra-cmake-modules, graphviz, kdoctools
+, fetchpatch
 
 , akonadi, alkimia, aqbanking, gmp, gwenhywfar, kactivities, karchive
 , kcmutils, kcontacts, kdewebkit, kdiagram, kholidays, kidentitymanagement
@@ -20,6 +21,13 @@ stdenv.mkDerivation rec {
     sha256 = "1c9apnvc07y17pzy4vygry1dai5ass2z7j354lrcppa85b18yvnx";
   };
 
+  # Fix build with Qt 5.11.
+  patches = lib.singleton (fetchpatch {
+    url = "https://cgit.kde.org/kmymoney.git/patch/?id="
+        + "e5198a902996b27bf9abde0ad24af82d55ab5dc1";
+    sha256 = "1h2f1xznf7343s26fh94x8n2ci0pijk5j86f24lvghawsw848316";
+  });
+
   # Hidden dependency that wasn't included in CMakeLists.txt:
   NIX_CFLAGS_COMPILE = "-I${kitemmodels.dev}/include/KF5";