Poor-man's ftracing for userspace

Make sure whatever you trace has #included parlib.h.
BSD sockets library relies on parlib

Included via "priv.h".  Had to add some #includes there, since they were
assuming priv.h would be included after some other files.

Also removed ntohl.c.  priv.h includes glibc's version.

I originally did this to make a poor-ftrace of the BSD sockets library.  It's
probably easier to just put -include parlib.h into the user/bsd/Makefile in the
future.  Cleaning out ntohl.c was nice.