[vim/vim] Update vimrc_example to check for +persistent_undo (#943)

[Eric Nielsen]

Otherwise initialization could fail with

Error detected while processing ~/.vimrc:
line   28:
E518: Unknown option: undofile

if +persistent_undo is not enabled.

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/943

Commit Summary

• Update vimrc_example to check for +persistent_undo

File Changes

• M runtime/vimrc_example.vim (4)

Patch Links:

• https://github.com/vim/vim/pull/943.patch
• https://github.com/vim/vim/pull/943.diff

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[Bram Moolenaar]

Closed #943.

[Bram Moolenaar]

Thanks, I'll include it.