use \n line endings

[MichaelChirico]

Closes #6369

Approach:

for (f in list.files(recursive = TRUE)) {
  ch <- tryCatch(readChar(f, file.size(f)), condition=identity)
  if (inherits(ch, "condition")) next
  nch <- tryCatch(nchar(ch), condition=identity)
  if (inherits(nch, "condition")) next
  if (grepl("\r", ch, fixed = TRUE)) {
    cat(sprintf("Overwriting \\r line endings in %s\n", f))
    writeLines(readLines(f), f)
  }
}

[tdhock]

great thanks but I just merged the other PR #6368 so now there are conflicts, sorry

[MichaelChirico]

Thanks, regenerated CODEOWNERS.