configure: Copy test data to build directory

The QDict unit-tests (check-qdict) will fail when ran on a different
build directory. That's, it only works when ran on the source dir.

This happens because its data file (qdict-test-data.txt) is not
copied to the build dir. Fix it.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
