Fix moc command for Qt5.2
Fix moc command for Qt5.2

The check was already there, but since Qt5 CMake files are being shipped with
Qt5 itself, the check was meaningless as the only thing which matters is
Qt's version, and not CMake's one.

Reviewed-by: David Edmundson <2fbbc4cabedec4253c2922f51eef7aa8c2146499@kde.org>

freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyIM/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,tiagosh/telepathy-qt,TelepathyIM/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,TelepathyQt/telepathy-qt,TelepathyIM/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4