Fix the configure-script for FreeBSD.
Fix the configure-script for FreeBSD.

The `netinet/*.h' includes need `sys/types.h' to be included before they are.
This prevented building under FreeBSD as reported by `_oli_'.

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