treewide: remove unused variables (#63177)

* treewide: remove unused variables

* making ofborg happy

pkgs/development/beam-modules/fetch-rebar-deps.nix

@@ -1,4 +1,4 @@
-{ stdenv, rebar3, curl }:
+{ stdenv, rebar3 }:
 
 { name, version, sha256, src
 , meta ? {}
@@ -29,4 +29,5 @@ stdenv.mkDerivation ({
   outputHash = sha256;
 
   impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
+  inherit meta;
 })

pkgs/development/beam-modules/rebar3-release.nix

@@ -1,5 +1,5 @@
-{ stdenv, writeText, erlang, rebar3, openssl, libyaml,
-  pc, lib }:
+{ stdenv, writeText, erlang, rebar3, openssl,
+  lib }:
 
 { name, version
 , src
@@ -18,8 +18,6 @@
 with stdenv.lib;
 
 let
-  debugInfoFlag = lib.optionalString (enableDebugInfo || erlang.debugInfo) "debug-info";
-
   shell = drv: stdenv.mkDerivation {
           name = "interactive-shell-${drv.name}";
           buildInputs = [ drv ];