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/os-specific/linux/kernel/manual-config.nix

@@ -76,7 +76,7 @@ let
         (isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
     in (optionalAttrs isModular { outputs = [ "out" "dev" ]; propagatedOutputs = ""; }) // {
       passthru = {
-        inherit version modDirVersion config kernelPatches;
+        inherit version modDirVersion config kernelPatches configfile;
       };
 
       inherit src;