packaging: Build manpage in separate directory to other documentation (!11085) · Merge requests · Glasgow Haskell Compiler / GHC · GitLab · GHC

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We were installing two copies of the manpage:

One useless one in the share/doc folder, because we copy the doc/ folder into share/
The one we deliberately installed into share/man etc

The solution is to build the manpage into the manpage directory when building the bindist, and then just install it separately.

Fixes #23707 (closed)