CARP: fix Windows compile error

(the issue was discovered by Gisle Vanem)
netinet/in.h shouldn't be included during a Windows compile. The fix is
to remove the #include from print-carp.c and let tcpdump-stdinc.h do its
job.
CALM FAST/GeoNet: fix Windows compile errors

It didn't work out-of-the box because my MSVC (v16 from Visual C
Express 2010) isn't a C99 compiler; you cannot have code ahead of
declarations.