Fredrik Gustafsson authored Nov 20, 2019 and Timo Teräs committed May 06, 2020

When creating an index apk warns if a dependency is missing a provider.
However when using a multi-arch repository, it's not an error that
a certain architecture is missing a dependency because that dependency
could be in an other architecture. Since apk index doesn't know about
this, add an argument to disable that warning.

Maintainer note: rebased for new option handling, and minor stylistic
adjustments.

Signed-off-by: Fredrik Gustafsson <fredrigu@axis.com>