export: Allow multiple exports when only one export is installed

Since commit c8997fc046 (export: Allow depending on targets exported
multiple times, 2024-12-26, v4.0.0-rc1~241^2), it is possible to depend
on a target exported multiple times so long as the target is exported in
only one set and with a consistent namespace.  However, as a
side-effect, a target could not be in multiple export sets even if only
one of those sets was installed.

Update the check so that uninstalled export sets do not count towards a
target being exported multiple times.

0 files changed, 0 insertions, 0 deletions