build/pkgs/pcre: Remove

[mkoeppe]

📚 Description

Remove the spkg pcre; it was a dependency of our r package, which was reduced to a dummy package recently.

Closes #32231

📝 Checklist

• I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (f449b14) 88.62% compared to head (f61e83a) 88.61%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35083      +/-   ##
===========================================
- Coverage    88.62%   88.61%   -0.02%     
===========================================
  Files         2148     2148              
  Lines       398653   398653              
===========================================
- Hits        353308   353258      -50     
- Misses       45345    45395      +50     

see 31 files with indirect coverage changes

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[dimpase]

$ git grep pcre
build/pkgs/_prereq/distros/fedora.txt:# Needed for pcre configure, see https://trac.sagemath.org/ticket/29129
...

it actually adds diffutils, which is fine and can be kept, but this comment looks outdated

[mkoeppe]

OK, I've removed the comment

[mkoeppe]

Thanks, Dima!

[vbraun]

Merge conflict

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: f61e83a

[dimpase]

lgtm