Log Message:
(devel/R-callr) Updated from 3.3.1 to 3.4.0

(pkgsrc changes)
 - Add (some) TEST_DEPENDS, but 'make test' not completed yet,
   some not yet R-packages are required

(upstream changes)
# callr 3.4.0
* All callr functions and background processes properly clean up
  temporary files now (#104).

* callr now uses a more principled setup for the library path, and
  restores the related environment variables in the child process.
  This is a **breaking change** if you relied on having the library set
  in a `system()` subprocess of the callr subprocess (#114).

* Better printing of `rlang_error`s that happened in the subprocess.

* The stacking of error objects is slightly different now, as we keep the
  unmodified error from the subprocess in `$parent$error`.

* callr now loads `.Rprofile` files from the current working directory
  by default. This works better with packrat, renv, and other software
  that relies on a local profile for initialization (#131).

# callr 3.3.2
No user visible changes in this version.