message: remove obsolete flag "codegen-unit"
diff: @@ -60,8 +60,6 @@ debug = true # controls whether the compiler passes `-C debuginfo`
  rpath = false # controls whether the compiler passes `-C rpath`
  lto = false # controls `-C lto` for binaries and staticlibs
  debug-assertions = true # controls whether debug assertions are enabled
  -codegen-units = 1 # controls whether the compiler passes `-C codegen-units`
  - # `codegen-units` is ignored when `lto = true`
  panic = "abort" # Call abort on panic https://github.com/rust-lang/rust/pull/32900
  # The release profile, used for `cargo build --release`.
  