Added extern "C" guard around the header file, so that C++ programs will link us in sanely.
Added extern "C" guard around the header file, so that C++ programs will link us in sanely.

--HG--
extra : convert_revision : svn%3A99687598-2e92-11dd-8019-fe7b9d601d1b/trunk%401234

incbee/Growl,PersonifyInc/growl,PersonifyInc/growl,PersonifyInc/growl,PersonifyInc/growl,incbee/Growl,incbee/Growl,PersonifyInc/growl,incbee/Growl,incbee/Growl