kde4support: kstandarddirs_unittest fix

[Alex Merry]

In my continuing mission to make the frameworks green on Jenkins:

This makes the tests work even when not installed, even when kde4support
is installed to a separate prefix to the rest of frameworks (as it is on
Jenkins -- although this setup is dangerous for *real* users of
KStandardDirs).

The one bit that is still failing is testSetXdgDataDirs() and
testRestrictedResources(), which both fail for the same reason.

Basically, the test checks that
 CMAKE_INSTALL_PREFIX "/share/applications/"
is in the xdgdata-apps resource.  However, KStandardDirs puts
 CMAKE_INSTALL_PREFIX "/share/applications/kde5/"
in the xdgdata-apps resource.

Which is right: the test or KStandardDirs?

Alex
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