Make some routines take a struct wtap_pkthdr * as an argument.

For some routines that take multiple arguments that come from a struct
wtap_pkthdr, pass a pointer to the struct wtap_pkthdr in question,
rather than the separate arguments.  Do this even if we're passing
expressions that were earlier assigned to the struct wtap_pkthdr fields
in question.  This simplifies the calling sequences and ensures that the
right values are picked up by the called routine; in at least one case
we were *not* passing the right values (the code to handle Simple Packet
Blocks in pcap-ng files).

Also, call the byte-swapping routines for pseudo-header fields only if
we need to do byte-swapping.

Change-Id: I3a8badfcfeb0237dfc1d1014185a67f18c0f2ebe
Reviewed-on: https://code.wireshark.org/review/119
Reviewed-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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