app-editors/vim,vim-core: Fix conflicts in installation of defaults.vim

[dongsupark]

When app-editors/vim has minimal USE flag set, while app-editors/vim-core does not set that, installation of packages fails like that:

* This package will overwrite one or more files that may belong to other
 * packages (see list below).
 * 
 * Detected file collision(s):
 * 
 *      /usr/share/vim/vim82/defaults.vim
 * 
 * Searching all installed packages for file collisions...
 * 
 * Press Ctrl-C to Stop
 * 
 * app-editors/vim-8.2.3741:0::gentoo
 *      /usr/share/vim/vim82/defaults.vim
 * 
 * Package 'app-editors/vim-core-8.2.3741' NOT merged due to file
 * collisions. If necessary, refer to your elog messages for the whole
 * content of the above message.

To fix that, on the vim side, install defaults.vim only if the file is not installed already from vim-core.
On the vim-core side, do not install defaults.vim when the file is already installed from vim.

[gentoo-bot]

Pull Request assignment

Submitter: @dongsupark
Areas affected: ebuilds
Packages affected: app-editors/vim, app-editors/vim-core

app-editors/vim: @gentoo/vim
app-editors/vim-core: @gentoo/vim

Linked bugs

Bugs linked: 830177

---

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2022-01-27 17:36 UTC
Newest commit scanned: cf0572c
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/b7b13563bc/output.html

[thesamesam]

Thank you!