Disable GNULIB's year2038 support for 64-bit time_t

GNUTLS exposes time_t in its public API and thus the size of time_t
is ABI relevant. It can't be changed in size without breaking
ABI compatibility with applications built against GNUTLS that use
the default time_t size.

https://gitlab.com/gnutls/gnutls/-/issues/1466
https://bugzilla.redhat.com/show_bug.cgi?id=2174758
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

gnutls.spec

@@ -241,6 +241,9 @@ pushd native_build
 %endif
 %if %{with_srp}
            --enable-srp-authentication \
+%endif
+%ifarch %{ix86}
+           --disable-year2038 \
 %endif
 	   --enable-sha1-support \
            --disable-static \