glibc: Drop version 2.33

oe-core now comes with a newer version: 2.34. 2.33 version was an
upgrade for dunfell but now that we move to newer layers, we can drop it
and use the latest in upstream.

We can also safely drop CVE-2021-33574 patch as it was included in the
upgraded version.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>