The patch file starts from a fixed version (uim-1.8.5)

This is because #uim-vi will use its own version numbers
(uim-vi-1.8.5, uim-vi-1.8.6, uim-vi-1.8.7) that may differ
from #uim versions (uim-vi-1.8.6 may be based on uim-1.8.5.)

In the future, the starting point may vary