Enabled smackx unit tests for 'test-unit' target

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13400 b35dd754-fafc-0310-a699-88a17e54d16e
Whitespace fixes in build.xml

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13401 b35dd754-fafc-0310-a699-88a17e54d16e