Install the sunrise/sunset computation header
Summary:
This is exported and documented API that isn't used internally in
KHolidays, so not installing this looks like an oversight.
Use-case: compute whether to use the day or night variant of the
Breeze weather icons.
Reviewers: winterz
Reviewed By: winterz
Subscribers: winterz, kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D14537