This is oh so boring, but I need to differentiate send from receive
when dumping from withing ppsi itself.  This is a long patch that has
no effect on tools/ptpdump, since it pases the empty string as prefix.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This commit allows dump-funcs.c to be build from a freestanding
environment. It uses __STDC_HOSTED__ to select what to include,
and relies on "network_types.h" to fill the gaps. Such header is not
part of this commit.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This commit removes the "dest" argument to dumpstruct(), which now
uses printf() and not fprintf(dest,).  I plan to use these functions
withing PPSi itself if the "frames" diagnostic level is 2, and I'd
better avoid to hack around fprintf.

ptpdump is not changed, as it already used dumpstruct() with stdout
as destination.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>