Freebsd patches

Here's patches I realized to compile with FreeBSD-CURRENT and clang.
The Platform and config files have been copied mostly from Linux model with all required modification.

Note: 

src/IndicationService/IndicationService.cpp have 2 unused declaration (included in patches)

Also src/Pegasus/Query/QueryCommon/QueryIdentifier.h expose QueryException.h which causes problems when creating Provider with CIMInstanceQueryProvider, wrapping it around PEGASUS_INTERNAL_ONLY fixes the problem.