[COMMITTED] configure: Fix bootstrap build after 570c46d36b (BZ 33985)

[Jeffrey Law]

On 3/13/2026 7:10 AM, Adhemerval Zanella wrote:
> The 570c46d36b make libgcc_s to be defined for have-cc-with-libunwind=noi
> (default for gcc builds) without taking into consideration that the compiler
> can link against -lgcc_s (defined by have-libgcc_s).
>
> Checked with a build-many-glibc.py for x86_64-linux-gnu.
Thanks.  That fixed the overnight failures I saw in my tester.
jeff