use evutil_socket_t instead of int to define socket types. Patch my mikedLd :)

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14187 f4695dd4-2c0a-0410-b89c-da849a56a58e
function pointer type correctness. mikedld

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14188 f4695dd4-2c0a-0410-b89c-da849a56a58e