Start the merging-rebase to v2.21.0

We use this opportunity to move the following topics into the
`ready-for-upstream` branch thicket: msvc, visual-studio,
no-perl-makemaker, program-data-config and ansi-unicode.

This commit starts the rebase of a4b818922f to 2bb64867dc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin
2019-02-24 20:33:22 +01:00

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