Changes to testsuite

Changes to testsuite:
commit 435c5955359d6e46a2fb905231678ac37ac0e71a
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Tue Nov 12 11:08:36 2013 +0100

    Run T7478, plugins06, T7918 only when dynamic libraries are available

    as they fail in a non-helpful way otherwise. This should help the
    testsuite pass on travis.