Bug#439614: Investigations about/suggested fix for build failure

[Andreas Kirschbaum]

The build failure is because the function matrix-concat() was removed
from libjaxen-java (which is used by this package);
http://jaxen.org/status.html contains

    Jaxen 1.1 Beta 12
    [...]
    The matrix-concat extension function has been removed because its
    license staus was unclear, the originator could not be contacted,
    and it was undocumented and untested. If someone cares to
    reimplement it, it could be restored in the future.


Removing the unit test file
dom4j-1.6.1+dfsg/src/test/org/dom4j/xpath/MatrixConcatTest.java fixes
the build failure.