kdoctools test if running uninstalled

[Albert Astals Cid]

Hey Ralf, 

the kdoctools_install test fails when running uninstalled (i.e. like how CI does) since it can't find kf5/kdoctools/customization

I tried to make it work but doesn't seem it's going to be easy since meinproc really looks for the "kf5/kdoctools/customization" hierarchy that is nowhere to be found in the build dir.

Maybe we should disable this test meanwhile? Or only run it if you have kdoctools installed? (like most of us do?).

Cheers,
  Albert