Using `--configure.args` with configure.win on Windows

Looking at the code for `R CMD INSTALL` [1] it looks like
`--configure-args` is not used on Windows, so there is not a way to pass
arguments to the `configure.win` script like there is for `configure`.

Is this lack intentional or simply an oversight because support for
configure.win was added later?

[1]:
https://github.com/wch/r-source/blob/8bc3a6f4b0c2fca3195cac427e9ad8b4448eaa73/src/library/tools/R/install.R#L670-L697