put back DelimitedFiles as a non-sysimage "stdlib"

[KristofferC]

Fixes #48161.

Goes together with JuliaLang/Pkg.jl#3373.

[vchuravy]

You probably also want to list it in https://github.com/JuliaLang/julia/blob/master/contrib/cache_stdlibs.jl

[KristofferC]

I don't know what that file does but I added it to it :)

[vchuravy]

It creates a cachefile so that the user doesn't need to precompile DelimtedFiles from the stdlib.

[DilumAluthge]

Can you add the following checksums?

ERROR: The working directory is dirty.
--
  | Output of git status:
  | HEAD detached at 3186096a8eb
  | Untracked files:
  | (use "git add <file>..." to include in what will be committed)
  | deps/checksums/DelimitedFiles-db79c842f95f55b1f8d8037c0d3363ab21cd3b90.tar.gz/
  | stdlib/DelimitedFiles-db79c842f95f55b1f8d8037c0d3363ab21cd3b90/
  |  
  | nothing added to commit but untracked files present (use "git add" to track)
  | 🚨 Error: The command exited with status 1

[DilumAluthge]

Also, could we add a file stdlib/not-stdlibs.txt with contents:

DelimitedFiles

[KristofferC]

Also, could we add a file stdlib/not-stdlibs.txt with contents:

I didn't really want to couple this PR with the exact way of specifying the mechanism of that. For example a .txt file feels strange.

[DilumAluthge]

For example a .txt file feels strange.

We could have a line in stdlib/Makefile of the form:

PKG_DISREGARD = DelimitedFiles Foo Bar Baz

And then Pkg could look for that line?

[KristofferC]

Pkg would look in the Makefile? We don't ship that one do we?

[DilumAluthge]

Pkg would look in the Makefile? We don't ship that one do we?

Oh whoops, you're right, Pkg can only use what's actually shipped in the final tarball.

[PallHaraldsson]

DelimitedFiles is mentioned in NEWS, or well now HISTORY. Is it outdated, and should be dropped there?