Merge staging into closure-size

The most complex problems were from dealing with switches reverted in
the meantime (gcc5, gmp6, ncurses6).
It's likely that darwin is (still) broken nontrivially.

pkgs/development/libraries/uid_wrapper/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl, cmake, pkgconfig }:
 
 stdenv.mkDerivation rec {
-  name = "uid_wrapper-1.1.1";
+  name = "uid_wrapper-1.2.0";
 
   src = fetchurl {
     url = "mirror://samba/cwrap/${name}.tar.gz";
-    sha256 = "0y033cjs0kwmpx70xc4wh789vk9rw6bziizs28h50ad7lyyvx5b9";
+    sha256 = "0sfznk53kmz9m3rxwbv4pwwqs4bw3kr917y4n53h5jaxjym0m4c0";
   };
 
   nativeBuildInputs = [ cmake pkgconfig ];