Fix compilation issue reported by Vincent on Windows (stdint and c++ compiler), setup a negative value for flagging the unknown level.
Fix compilation issue reported by Vincent on Windows (stdint and c++ compiler), setup a negative value for flagging the unknown level.

SVN revision: 42049

turran/eina,gfriloux/eina,turran/eina,gfriloux/eina,turran/eina,gfriloux/eina