Merge branch 'master' into staging-next

There ver very many conflicts, basically all due to
name -> pname+version.  Fortunately, almost everything was auto-resolved
by kdiff3, and for now I just fixed up a couple evaluation problems,
as verified by the tarball job.  There might be some fallback to these
conflicts, but I believe it should be minimal.

Hydra nixpkgs: ?compare=1538299

pkgs/development/libraries/live555/default.nix

@@ -3,14 +3,14 @@
 # Based on https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD
 stdenv.mkDerivation rec {
   pname = "live555";
-  version = "2019.06.28";
+  version = "2019.08.16";
 
   src = fetchurl { # the upstream doesn't provide a stable URL
     urls = [
       "mirror://sourceforge/slackbuildsdirectlinks/live.${version}.tar.gz"
       "https://download.videolan.org/contrib/live555/live.${version}.tar.gz"
     ];
-    sha256 = "0pn5zhid9z8dsmwkhp2lvy84j5ahjskq1a8srdhd06hvh2w8dh2r";
+    sha256 = "1y77dc5qxd731w96x707iibavmkfayy5s557d7lasg742h36lcqv";
   };
 
   postPatch = ''