PEP 644: Mention Void and Gentoo changes

Signed-off-by: Christian Heimes <christian@python.org>

pep-0644.rst

@@ -124,7 +124,7 @@ OpenSSL 1.1.1 added TLS 1.3, SHA-3, X448 and Ed448.
 - Debian 10 Buster
 - Fedora 29+
 - FreeBSD 11.3+
-- Gentoo Linux stable
+- Gentoo Linux stable (dropped LibreSSL as alternative in January 2021 [10]_)
 - HardenedBSD (switched back to OpenSSL in 2018 [3]_)
 - Linux Mint 19.3+
 - macOS (python.org installer)
@@ -135,6 +135,7 @@ OpenSSL 1.1.1 added TLS 1.3, SHA-3, X448 and Ed448.
 - SUSE Enterprise Linux 15-SP2
 - Ubuntu 18.10+
 - Ubuntu 20.04 LTS / Focal
+- VoidLinux (switched back to OpenSSL in March 2021 [5]_)
 - Windows (python.org installer, Conda)
 
 
@@ -159,10 +160,11 @@ created: 2014-04 (forked from OpenSSL 1.0.1g)
 - OpenBSD
 - OpenELEC (discontinued)
 - TrueOS (discontinued)
-- VOID Linux (currently moving back to OpenSSL [5]_)
 
-Some distributions like FreeBSD, Gentoo, and OPNsense also feature LibreSSL
-instead of OpenSSL as non-standard TLS libraries.
+Some distributions like FreeBSD and OPNsense also feature LibreSSL
+instead of OpenSSL as non-standard TLS libraries. Gentoo discontinued
+LibreSSL as an alternative to OpenSSL in January 2021 [10]_ due to
+compatibility issues and little testing.
 
 OpenBSD ports has a port ``security/openssl/1.1`` which is documented as
 "[...] is present to provide support for applications which cannot be made
@@ -324,11 +326,12 @@ References
 .. [2] https://github.com/libressl-portable/portable/issues/455
 .. [3] https://hardenedbsd.org/article/shawn-webb/2018-04-30/hardenedbsd-switching-back-openssl
 .. [4] https://lists.alpinelinux.org/~alpine/devel/%3CCA%2BT2pCGFeh30aEi43hAvJ3yoHBijABy_U62wfjhVmf3FmbNUUg%40mail.gmail.com%3E
-.. [5] https://github.com/void-linux/void-packages/issues/20935
+.. [5] https://voidlinux.org/news/2021/02/OpenSSL.html
 .. [6] https://forums.swift.org/t/rfc-moving-swiftnio-ssl-to-boringssl/18280
 .. [7] https://openports.se/security/openssl/1.1
 .. [8] https://www.openssl.org/docs/OpenSSL300Design.html
 .. [9] https://www.openssl.org/policies/releasestrat.html
+.. [10] https://www.gentoo.org/support/news-items/2021-01-05-libressl-support-discontinued.html
 
 
 Copyright