Fix linking with tp-qt4 in the tests.
Fix linking with tp-qt4 in the tests.

freedesktop-unofficial-mirror/telepathy__telepathy-qt4-yell,mck182/telepathy-qt4-yell,mck182/telepathy-qt4-yell,mck182/telepathy-qt4-yell,mck182/telepathy-qt4-yell,freedesktop-unofficial-mirror/telepathy__telepathy-qt4-yell,freedesktop-unofficial-mirror/telepathy__telepathy-qt4-yell,freedesktop-unofficial-mirror/telepathy__telepathy-qt4-yell