[MacPorts] #39182: MacVim @7.3.snapshot66_3: should use vim's vimfiles directory

[MacPorts]

#39182: MacVim @7.3.snapshot66_3: should use vim's vimfiles directory
-------------------------+----------------------
 Reporter:  larryv@…     |      Owner:  raimue@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  MacVim
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 A number of ports install Vim support files into
 `${prefix}/share/vim/vimfiles`. MacVim currently doesn’t pick these up.

 The attached patch corrects this by adding the vim port’s `vimfiles`
 directory to MacVim’s default `runtimepath`.

 Another option would be to create a symlink at
 `${applications_dir}/MacVim.app/Contents/Resources/vim/vimfiles` pointing
 to `${prefix}/share/vim/vimfiles`, but that feels a little sneaky to me.
 It would admittedly be a little simpler.

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Ticket URL: <https://trac.macports.org/ticket/39182>
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