bintools-wrapper, cc-wrapper: avoid invalid export of 'expand-response-params'

POSIX sh (and `bash`) impose a restriction on environment variable name
format and disallow hypheps in the names. Normally it's not a problem
as nothing usually tries to refer nyphenated names.

One exception is `nix develop` (https://github.com/NixOS/nix/issues/6848):

    $ nix develop -f. gcc -L
    gcc-wrapper> ...-get-env.sh: line 70: expand-response-params: bad substitution

Note that bash usually uses explicitly created `expandResponseParams`
variant of the same variable.

To work the problem around let's avoid environment variable export and move
it to `passthru` for `cc` (used ina  few places) and remove it completely for
`binutils` (does not seem to be used at all).

pkgs/build-support/bintools-wrapper/default.nix

@@ -365,7 +365,7 @@ stdenv.mkDerivation {
     ##
     + extraBuildCommands;
 
-  inherit dynamicLinker expand-response-params;
+  inherit dynamicLinker;
 
   # for substitution in utils.bash
   expandResponseParams = "${expand-response-params}/bin/expand-response-params";

pkgs/build-support/cc-wrapper/default.nix

@@ -157,6 +157,8 @@ stdenv.mkDerivation {
         '(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
     '';
 
+    inherit expand-response-params;
+
     inherit nixSupport;
   };
 
@@ -540,7 +542,6 @@ stdenv.mkDerivation {
         (name: value: "echo ${toString value} >> $out/nix-support/${name}")
         nixSupport);
 
-  inherit expand-response-params;
 
   # for substitution in utils.bash
   expandResponseParams = "${expand-response-params}/bin/expand-response-params";