build: Add a -Dgtk_doc=true option for enabling/disabling documentation

Philip Withnallrequested to merge
6-gtk-doc-optional into main

This allows gtk-doc to be dropped as a dependency if people don’t want docs.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Fixes: #6 (closed)

Closes #6 (closed)

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