openssl_1_0_2: 1.0.2t -> 1.0.2u (low-severity security)

Fixes #77266: CVE-2019-1551
https://www.openssl.org/news/secadv/20191206.txt

(cherry picked from commit 961d0cf9)
Oops - I realized too late that the rebuild amount is minimal,
so why not have it immediately in master.