A. Wilcox authored May 01, 2019 and Timo Teräs committed May 01, 2019

BIT(1) corresponds with decimal 2, which is the first available repository.

Before this fix, `apk list -O` would list every package installed from the
first available repository, which is the 'system' repository on most Adélie
Linux computers.

After this fix, `apk list -O` correctly lists only the packages which are
no longer available.