runtime(vim): Update base-syntax, remove old unused syntax groups. (vim/vim#14146)
Remove old unused syntax groups.
- vimRegion, vimPattern and vimKeyword removed in Vim 5.3.
- vimAuSyntax, vimAutoCmdOpt, vimAutoSet and vimStatement removed in 5.6.
The following were linked in :hi commands but never defined with :syn
and, most likely, never used:
- vimHLMod introduced in 5.0.
- vimKeycode and vimKeycodeError introduced in 5.4.
- vimElseif introduced in 5.6.
- vimFold introduced in 6.4.
- vimOperStar (and vimoperStar) introduced in 9.0.
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Co-authored-by: dkearns <dougkearns@gmail.com>
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