Merge branch 'bc/rust-by-default' into jch

Rust support is enabled by default (but still allows opting out) in
some future version of Git.

* bc/rust-by-default:
  Enable Rust by default
  Linux: link against libdl
  ci: install cargo on Alpine
  docs: update version with default Rust support

diff --cc Makefile
Simple merge

diff --cc config.mak.uname
Simple merge

diff --cc meson.build
Simple merge