Condition is deprecated already, but there is no need for the
us to use the low-level C-API, when in fact there is a C++ fascade
that calls on this via the C++ abstraction, osl::Condition.

This will make it much easier to switch to using std::condition_variable

Change-Id: Ia362666ff241293e143de0fa1dc0bc3a990bef82
Reviewed-on: https://gerrit.libreoffice.org/35388Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>