win32: AI_ADDRCONFIG compat
win32: AI_ADDRCONFIG compat

Menitoned in pgbouncer/pgbouncer#100

markokr/libusual,markokr/libusual,markokr/libusual,ifduyue/libusual,ifduyue/libusual,ifduyue/libusual,markokr/libusual,ifduyue/libusual