There is some misconception about the general approach with this idea. Whilst I applaud any attempt to reduce the number of defines, as it eases the implementation of new features (due to not stumbling over undetected #define issues), I strongly suggest taking a different route here.
HAVE_LIBPCAP not only serves as a check for having libpcap in the first place, but also for changing the UI if it is not there. Which would mean, that putting a small non-functional header-only satisfying version within the repository would lead to versions of Wireshark being build, acting very differently then they are supposed to. For instance, remote capture capabilities are only enabled, if the corresponding function actually exists. Which leads to reduced code and binaries if the function does not. Now putting a small reduced function which only serves to satisfy some header functionality within the repository would bloat up the general binary.
So in conclusion, I vote to not include non-functional code within the source-code just to satisfy #defines
regards
Roland
