Migrate all heimdal -> libheimdal

Also disable heimdal references in samba as it uses internal api
features not guaranteed to be stable

pkgs/applications/networking/browsers/firefox-bin/default.nix

@@ -30,7 +30,7 @@
 , nspr
 , nss
 , pango
-, heimdal
+, libheimdal
 , libpulseaudio
 , systemd
 }:
@@ -102,7 +102,7 @@ stdenv.mkDerivation {
       nspr
       nss
       pango
-      heimdal
+      libheimdal
       libpulseaudio
       systemd
     ] + ":" + stdenv.lib.makeSearchPath "lib64" [

pkgs/applications/office/zotero/firefox-bin/default.nix

@@ -30,7 +30,7 @@
 , nspr
 , nss
 , pango
-, heimdal
+, libheimdal
 , libpulseaudio
 , systemd
 }:
@@ -102,7 +102,7 @@ stdenv.mkDerivation {
       nspr
       nss
       pango
-      heimdal
+      libheimdal
       libpulseaudio
       systemd
     ] + ":" + stdenv.lib.makeSearchPath "lib64" [

pkgs/top-level/all-packages.nix

@@ -9097,7 +9097,7 @@ let
 
   samba4 = callPackage ../servers/samba/4.x.nix {
     python = python2;
-    kerberos = heimdal;
+    kerberos = null;  # Bundle kerberos because samba uses internal, non-stable functions
     gnutls = gnutls33;
     # enableLDAP
   };