[Libreoffice] OSL_FORMAT: printf-style assertion messages

[Stephan Bergmann]

FYI, recently added OSL_FORMAT to ols/diagnose.h that lets you have 
printf-style messages in C++ OSL_ENSURE, OSL_FAIL, DBG_ASSERT, etc.  To 
be used a la

OSL_ENSURE(i == 5, OSL_FORMAT("i should be 5 but is %d", i));

-Stephan