Skip test which does not work in mock

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

rust-sysinfo.spec

@@ -94,7 +94,8 @@ which use "debug" feature of "%{crate}" crate.
 
 %if %{with check}
 %check
-%cargo_test
+# https://github.com/GuillaumeGomez/sysinfo/issues/227
+%cargo_test -- -- --skip traits::SystemExt::new_with_specifics
 %endif
 
 %changelog