OSX uiwriter stacktrace needed

[Stephan Bergmann]

On 06/09/2015 02:54 PM, Bjoern Michaelsen wrote:
> However, OSX seems to be reliably broken now according to the tinderboxes.
> If someone manages to provide a backtrace, I would appreciate that, so I can
> investigate what broke and fix it.

should be fixed now with 
<http://cgit.freedesktop.org/libreoffice/core/commit/?id=54253f382e77483b2831af82cf90e2afb0cd55db> 
"Ensure single RTTI symbol instance" (which also re-enables the test)