hadrian: many builders do not pass `buildOptions` to `cmd`

As evidenced by the code in hadrian/src/Builder.hs (the code for Tar is slightly modified compared to master at the moment, comes from a WIP update to !3027 (closed)):

    runBuilderWith :: Builder -> BuildInfo -> Action ()
    runBuilderWith builder BuildInfo {..} = do
            [...]
            case builder of
                [...]
                Ar Unpack _ -> cmd echo [Cwd output] [path] buildArgs

                Autoreconf dir -> cmd echo [Cwd dir] ["sh", path] buildArgs

                Configure  dir -> do
                    [...]
                    cmd echo env [Cwd dir] ["sh", path] buildOptions buildArgs
                [...]
                GhcPkg Copy _ -> do
                    Stdout pkgDesc <- cmd [path]
                      [ "--expand-pkgroot"
                      , "--no-user-package-db"
                      , "describe"
                      , input -- the package name
                      ]
                    cmd (Stdin pkgDesc) [path] (buildArgs ++ ["-"])

                GhcPkg Unregister _ -> do
                    Exit _ <- cmd echo [path] (buildArgs ++ [input])
                    return ()

                [...]
                Make dir -> cmd echo path ["-C", dir] buildArgs

                Makeinfo -> do
                  cmd echo [path] "--no-split" [ "-o", output] [input]

                Xelatex -> do
                    unit $ cmd [Cwd output] [path]        buildArgs
                    unit $ cmd [Cwd output] [path]        buildArgs
                    unit $ cmd [Cwd output] [path]        buildArgs
                    unit $ cmd [Cwd output] ["makeindex"] (input -<.> "idx")
                    unit $ cmd [Cwd output] [path]        buildArgs
                    unit $ cmd [Cwd output] [path]        buildArgs

                Tar tarMode ->
                  let modeArg = case tarMode of
                        Create -> "-c"
                        Extract -> "-x"
                  in cmd buildOptions echo [path] (modeArg : buildArgs)

                _  -> cmd echo [path] buildArgs

While some builders have a specific way of, say, dealing with Cwd (e.g Make's -C argument), most of them don't pass buildOptions. The main consequence is that when we use something like runBuilderWithOptions to pass a specific Cwd to run the command(s) in, it is simply ignored.

This is at best inconsistent, if not simply bogus. We probably want to figure out a consistent, unified story there to avoid any surprise.