D8932: make docbook compilation optional

[Harald Sitter]

sitter created this revision.
sitter added reviewers: kfunk, sandsmark.
Restricted Application added a subscriber: kde-utils-devel.

REVISION SUMMARY
  khelpcenter isn't nearly as omnipresent as it was and redirecting the user
  to the html render of the documentation online is a very common occurance.
  in particular on Windows where I think we do not even ship the docbooks
  at all.

TEST PLAN
  cmake reports dep as optional

REPOSITORY
  R352 Filelight

BRANCH
  optional-docs

REVISION DETAIL
  https://phabricator.kde.org/D8932

AFFECTED FILES
  CMakeLists.txt

To: sitter, kfunk, sandsmark
Cc: kde-utils-devel
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