[R] Support for building package for Windows

[asfimport]

Reporter: Javier Luraschi / @javierluraschi

Related issues:

• [R] Enable package to be made available on CRAN (is depended upon by)

PRs and other links:

• GitHub Pull Request #3932

_{Note: This issue was originally created as ARROW-4911. Please see the migration documentation for further details.}

[asfimport]

Romain Francois / @romainfrancois:
Issue resolved by pull request 3932
#3932