Tom Coldrick authored May 09, 2019 and Freedesktop SDK Merge Bot committed May 09, 2019

Cherry picks the patch in openssl to address BIO_get_mem_ptr
regressions, as these have been breaking apps in flathub. Only targeting
18.08 as openssl 1.1.1c should be released by the time we release 19.08.

Addresses #758