Fix cross-platform issue about the file-format in which usbdump stores data. Until this patch it was not possible to exchange traces between 32-bit, 64-bit, big- and little endian platforms. The problem is the dynamic nature of the BPF timestamp in the header. All other fields are fixed size and little endian.
Fix cross-platform issue about the file-format in which
usbdump stores data. Until this patch it was not possible
to exchange traces between 32-bit, 64-bit, big- and
little endian platforms. The problem is the dynamic nature
of the BPF timestamp in the header. All other fields are
fixed size and little endian.

MFC after:	5 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase