firefox: remove removeReferencesTo

reverts f3d1410e08

After the merge of #359098 this workarround for ca-derivations
isn't needed anymore.

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

pkgs/applications/networking/browsers/firefox/wrapper.nix

@@ -19,7 +19,6 @@
 , sndio
 , libjack2
 , speechd-minimal
-, removeReferencesTo
 }:
 
 ## configurability of the wrapper itself
@@ -242,7 +241,7 @@ let
               };
             }));
 
-      nativeBuildInputs = [ makeWrapper lndir jq removeReferencesTo ];
+      nativeBuildInputs = [ makeWrapper lndir jq ];
       buildInputs = [ browser.gtk3 ];
 
 
@@ -417,9 +416,6 @@ let
       passthru = { unwrapped = browser; };
 
       disallowedRequisites = [ stdenv.cc ];
-      postInstall = ''
-        find "$out" -type f -exec remove-references-to -t ${stdenv.cc} '{}' +
-      '';
       meta = browser.meta // {
         inherit (browser.meta) description;
         mainProgram = launcherName;