Scheduled to be released on 2019-11-07.
https://internals.rust-lang.org/t/1-39-0-pre-release-is-ready-for-testing/11234
https://github.com/rust-lang/rust/blob/stable/RELEASES.md#version-1390-2019-11-07
Other port changes:
- Maybe adds LibreSSL 3.0.2 support (https://bugs.freebsd.org/241411) based on the relevant openssl-sys commits
- Move architecture specific patches to separate patch dirs in preparation for D20792
- Also add the patches from D20792 (PPC_ABI changes later after D22039 lands)