Needed to adjust definition of null_type for 64bit OS X system, which needs it to be long.
Needed to adjust definition of null_type for 64bit OS X system, which needs it to be long.

ChrisBFX/nanodbc,mcg1969/nanodbc,nanodbc/nanodbc,norsync/nanodbc,ChrisBFX/nanodbc,nanodbc/nanodbc,norsync/nanodbc,mcg1969/nanodbc