Provide the type explicitly for all subcalls

[Enchufa2]

When the pkgType option is set to anything different from "source", we really need to provide an explicit type for all subcalls, so that they won't error. Currently, tools::package_dependencies fail for options(pkgType="binary-source") when a requested package is not available as a binary, which is the whole point of "binary-source". It works with install.packages(..., type="binary-source") though because no subcall takes that value from getOption("pkgType").