Using a warning is probably too exalted for the current state
of the code, where UTF-8 errors are somewhat expected from
dissectors that are lax about input validation.
Use a debug level with its own "UTF-8" domain instead.
Using a dedicated domain allows to filter on encoding errors and
with some enhancements to the logging subsystem make them fatal
for tracking and debugging purposes.
Using a dedicated domain might have other drawbacks but for now
it seems like the best approach.
Add a LOG_LEVEL_ECHO that is always active and always non-fatal.
Use that to implement a WS_DEBUG_HERE() macro for quick print outs
during debugging sessions.
Blind attempt to fix Debian package brokenness managing
headers separately from install rules.
Global public headers that don't fit any of the Wireshark
libraries should be placed in include/.
Eventually the C files in the root dir should be placed somewhere
else as well (like src/) but this is not a priority.
Fixes#17726.
João Valverde