Use bundled libgit/libssh, the versions in ports are too old
Update lang/rust-nightly to 2021-02-12
Update devel/racer to 2.1.41
Import upstream patch to fix build issue for Firefox and related ports (https://bugzilla.mozilla.org/show_bug.cgi?id=1684261)
merge https://reviews.freebsd.org/D28520 or wait a little more for someone to comment / review it.
bump dependents ports before committing.