testing/openvi: prefix binaries, improve patch comments, fix {ex,view} symlinks
This merge request makes a number of interrelated changes to the package:
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Binaries are prefixed with "o" to avoid conflicting with vim (ex, view).
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Update the makefile patch to avoid /var/tmp mods with accurate notes and rename (rm-recover.patch). A PR has been opened upstream.
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Add a makefile patch to create relative rather than absolute symlinks for ex, view. A PR has been opened upstream.
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Add a makefile patch to handle DESTDIR more idiomatically. A PR has been opened upstream.