[Chapel Merge] Relax - cannot set CHPL_LLVM_CONFIG with bundled

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Branch: refs/heads/main
Revision: 7d1af8e
Author: mppf
Log Message:

Merge pull request #17993 from mppf/fix-errors-about-llvm-config

Relax - cannot set CHPL_LLVM_CONFIG with bundled

Follow-up to PR #17923.

  • changes the error into a warning
  • adjusts get_llvm_config to always set CHPL_LLVM_CONFIG for bundled
  • resolves a problem with failing to run the prediff for
    test/compflags/link/sungeun/static_dynamic among others

Reviewed by @daviditen - thanks!