[pcap-ng-format] Can there be multiple "os" and "hardware" option strings for an SHB?

[Hadriel Kaplan]

Need to decide if there can/can't be multiple shb_os and/or
shb_hardware options in a given SHB.

If there can, then does the ordering matter - for example, if a pcapng
file merger merges multiple SHBs into one, and adds the merging
machine's operating system and/or hardware info, does it prepend
itself or append itself to the list(s)?

-hadriel