Merge branch 'sh/mergetools-vimdiff1'

Mergetools update. * sh/mergetools-vimdiff1: mergetools/vimdiff: add vimdiff1 merge tool variant

Junio C Hamano committed Feb 25, 2021 at 16:43 UTC cadae717d557840d3566b7c0fc2003046e08c88f

No changes.