[Merge] lp:~vanvugt/qtubuntu/fix-cursor into lp:qtubuntu

[Daniel d'Andrada]

Review: Needs Fixing

unity8 and Qt knows more cursors than can be expressed by those mir_*_cursor_name symbols. Those FIXME fallbacks are not acceptable as they will cause regressions in Qt/QML based apps.
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https://code.launchpad.net/~vanvugt/qtubuntu/fix-cursor/+merge/306597
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