Installed tests

[Andreas Pakulat]

Hi,

it seems my changes did have an unfortunate impact on installed tests.
Two users reported an installing problem with kdelibs on IRC and it
seems the problem is that knotifytest in knotify/test is installed. The
problem is that the install() commands in the CMakeLists.txt are not
guarded anymore.

The question is: How do we want to handle this? With the guard the test
can only be installed if -DKDE4_BUILD_TESTS=on was given, but the test
can be built by running make <testname> nonetheless. Thats confusing
IMHO. However it seems without the guards the make install fails because
the .ui file is not processed (at least thats what is happening). 

So what shall be done with this (I think there might be other ocassions
where installed tests are used).

Andreas

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