D10739: Remove deprecated cmake code

[Hannah von Reth]

vonreth added inline comments.

INLINE COMMENTS

> apol wrote in CMakeLists.txt:20
> Then this also needs to go? Or just set it if the variable is defined?

That's how I understood the code, to allow to define a prebuild exe

REPOSITORY
  R246 Sonnet

REVISION DETAIL
  https://phabricator.kde.org/D10739

To: vonreth, kfunk, dfaure, vkrause, mlaurent
Cc: apol, #frameworks, michaelh
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