Add -haddock option under ci condition to fix Trac #16415
In order to use the :doc command in ghci, it is necessary
to compile for core libraries with -haddock option.
Especially, the -haddock option is essential for release building.
- The -haddock option may affect compile time and binary size.
- But hadrian has already set -haddock as the default.
- This patch affects the make-based building.
This patch has been split from !532.
(cherry picked from commit 33e37d0619a9d1d0b8088a109f7eeb4c6fd21027)