-
When we have multiple capture sources, for each one that is a pcapng source and supplies its own IDBs, don't create a fake IDB with invalid linktype WTAP_ENCAP_UNKNOWN and write it to the output file. Instead, use the IDBs from the source, remapping them as necessary. For non-pcapng sources, store the output IDB interface ID and write EPBs using that, since now the input interface ID and the output interface ID are not necessarily the same, if some of the other sources are not pcapng. Update the capture tests that use multiple FIFO sources, because now we don't add two extra IDBs, one for each FIFO. Instead there are 3 * 11 == 33 total IDBs. This prevents some various incompatibilites in Wireshark and other tools when a file has interfaces of more than one link type, and also has IDBs with an illegal WTAP_ENCAP_UNKNOWN link type. Fix #19080
