Log Message:
(devel/R-callr) Updated 3.5.1 to 3.7.0 (make test fails at PDF creation)

# callr 3.7.0

* Reporting errors is much faster now (#185).

* The `user_profile` option of `r_vanilla()` defaults to `FALSE` now (#194).

* It is now possible to set R environment variables (`R_ENVIRON_USER`,
  `R_PROFILE_USER`, etc.) via the `env` argument (#193).

# callr 3.6.0

* callr now supports starting an R process with a different architecture,
  so on Windows 64-bit R can start a 32-bit R background process, and
  vice-versa (#95).

* callr now handles symbolic arguments properly, and does not evaluate them.
  E.g. `callr::r(function(x) x, list(quote(foobar)))` works now (#175).

* `callr::r_session` does not leak file descriptors now in the sub-process
  (#184).