src/liboping.c: Use \#ifdef's around `EAI_SYSTEM'.
src/liboping.c: Use \#ifdef's around `EAI_SYSTEM'.

Apparently this define is mentioned in RFC3493 but not in SUS. At least Cygwin
seems not to have this define..

octo/liboping,iseki-masaya/liboping,octo/liboping,barak/liboping,iseki-masaya/liboping,iseki-masaya/liboping,barak/liboping,iseki-masaya/liboping,octo/liboping,octo/liboping,barak/liboping