[REVIEW 3-6] service manager dispose issue

[Stephan Bergmann]

<http://cgit.freedesktop.org/libreoffice/core/commit/?id=142d3ec875b446b56d0071c59d00937dea0cdd61> 
"Related fdo#52639: Do not destroy Implementations with mutex locked" 
addresses a crash on exit documented at 
<https://bugs.freedesktop.org/show_bug.cgi?id=52639#c14> "ReportBuilder: 
Creating a new report destroys .odb" (but apparently unrelated to that 
issue's main topic).  It is a regression introduced with the new service 
manager in LO 3.6.0, so please review and backport to libreoffice-3-6.

Thanks,
Stephan