qt4-constants-gen: correctly handle UTF-8
qt4-constants-gen: correctly handle UTF-8

I documented an error code with a Unicode ellipsis and Python got upset.

freedesktop-unofficial-mirror/telepathy__telepathy-qt,special/telepathy-qt-upstream,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt,special/telepathy-qt-upstream,anantkamath/telepathy-qt,TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,detrout/telepathy-qt,anantkamath/telepathy-qt,TelepathyQt/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,TelepathyIM/telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,TelepathyQt/telepathy-qt,detrout/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,TelepathyIM/telepathy-qt,tiagosh/telepathy-qt,special/telepathy-qt-upstream,freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,detrout/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt