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).

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