sync PKGBUILD from Arch, update to 20.0

Merged Ghost User requested to merge kodi20 into master

I'm not sure if we have made any modifications to the PKGBUILD by Arch, but at a glance it looks like we just use it as is.

Arch updated to Kodi 20 a little while ago, so this is just a sync with the Arch PKGBUILD to keep up to date.

Signed-off-by: Dan Johansen strit@manjaro.org

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