At the beginning of the top level CMakeLists.txt, the "message" function is redefined

This causes significant problems if the mongo C driver is included as a sub-project within a larger CMake built code base. 

After adding mongo C to my project I was unable to get any messages from CMake after the mongo scripts had been parsed.  Commenting out the following, solved the issue:

#function (message)

1. list (GET ARGV 0 MessageType)
2. if (MESSAGES_ENABLED)
3. list (REMOVE_AT ARGV 0)
4. _message (${MessageType} "${ARGV}")
5. endif ()
   #endfunction ()

CMake already has log levels, could these not be used?  I have included a link to the documentation below

https://cmake.org/cmake/help/latest/command/message.html

Thanks