Merge commit '3ab2949' from staging into master

Conflicts:
	pkgs/development/compilers/llvm/6/llvm.nix
	pkgs/servers/home-assistant/component-packages.nix

pkgs/misc/cups/cups-clean-dirty.patch

@@ -0,0 +1,13 @@
+diff --git a/scheduler/main.c b/scheduler/main.c
+index 8925c8373..acf031684 100644
+--- a/scheduler/main.c
++++ b/scheduler/main.c
+@@ -893,7 +893,7 @@ main(int  argc,				/* I - Number of command-line args */
+     * Write dirty config/state files...
+     */
+ 
+-    if (DirtyCleanTime && current_time >= DirtyCleanTime && cupsArrayCount(Clients) == 0)
++    if (DirtyCleanTime && current_time >= DirtyCleanTime)
+       cupsdCleanDirty();
+ 
+ #ifdef __APPLE__

pkgs/misc/cups/default.nix

@@ -25,6 +25,7 @@ stdenv.mkDerivation rec {
       url = "https://git.archlinux.org/svntogit/packages.git/plain/trunk/cups-systemd-socket.patch?h=packages/cups";
       sha256 = "1ddgdlg9s0l2ph6l8lx1m1lx6k50gyxqi3qiwr44ppq1rxs80ny5";
     })
+    ./cups-clean-dirty.patch
   ];
 
   nativeBuildInputs = [ pkgconfig removeReferencesTo ];
@@ -40,7 +41,6 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--localstatedir=/var"
     "--sysconfdir=/etc"
-    "--with-rundir=/run"
     "--enable-raw-printing"
     "--enable-threads"
   ] ++ optionals stdenv.isLinux [