[Bug driver/86030] specs file processing does not create response files for input directories

[john.soo+gcc-bugzilla at arista dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86030

--- Comment #18 from John Soo <john.soo+gcc-bugzilla at arista dot com> ---
And actually the proposed patch is not conservative enough, because the size of
the strings in argv/env also matter.