libreoffice: disable kdeIntegration

fixes #13651

@edolstra:
“IIRC, the "KDE integration" consists mainly in providing a Qt/KDE "File
open" dialog, which we can probably live without. In fact, it has been
known to malfunction if Libreoffice's KDE version is different from the
system KDE version.

So disabling this sounds like a good idea.”

pkgs/applications/office/libreoffice/default.nix

@@ -15,10 +15,12 @@
 , defaultIconTheme, glib
 , langs ? [ "en-US" "en-GB" "ca" "ru" "eo" "fr" "nl" "de" "sl" "pl" ]
 , withHelp ? true
+, kdeIntegration ? false
 }:
 
 let
-  langsSpaces = stdenv.lib.concatStringsSep " " langs;
+  lib = stdenv.lib;
+  langsSpaces = lib.concatStringsSep " " langs;
   major = "5";
   minor = "1";
   patch = "0";
@@ -90,7 +92,6 @@ in stdenv.mkDerivation rec {
   '';
 
   QT4DIR = qt4;
-  KDE4DIR = kde4.kdelibs;
 
   # Fix boost 1.59 compat
   # Try removing in the next version
@@ -178,7 +179,7 @@ in stdenv.mkDerivation rec {
     "--disable-report-builder"
     "--enable-python=system"
     "--enable-dbus"
-    "--enable-kde4"
+    (lib.enableFeature kdeIntegration "kde4")
     "--with-package-format=installed"
     "--enable-epm"
     "--with-jdk-home=${jdk.home}"
@@ -230,7 +231,7 @@ in stdenv.mkDerivation rec {
     [ ant ArchiveZip autoconf automake bison boost cairo clucene_core
       CompressZlib cppunit cups curl db dbus_glib expat file flex fontconfig
       freetype GConf getopt gnome_vfs gperf gtk3 gtk
-      hunspell icu jdk kde4.kdelibs lcms libcdr libexttextcat unixODBC libjpeg
+      hunspell icu jdk lcms libcdr libexttextcat unixODBC libjpeg
       libmspack librdf_redland librsvg libsndfile libvisio libwpd libwpg libX11
       libXaw libXext libXi libXinerama libxml2 libxslt libXtst
       libXdmcp libpthreadstubs mesa mythes gst_all_1.gstreamer
@@ -241,9 +242,10 @@ in stdenv.mkDerivation rec {
       libxshmfence libatomic_ops graphite2 harfbuzz
       librevenge libe-book libmwaw glm glew
       libodfgen CoinMP librdf_rasqal defaultIconTheme makeWrapper
-    ];
+    ]
+    ++ lib.optional kdeIntegration kde4.kdelibs;
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Comprehensive, professional-quality productivity suite, a variant of openoffice.org";
     homepage = http://libreoffice.org/;
     license = licenses.lgpl3;