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
The decision about the poller mechanism to use (select, poll, ...) was done twice: once by the build system and once by the code in poller.hpp. As the build-system can actually detect the mechanisms available, prefer that result to the hard coded defaults in poller.hpp. At the same time, remove the duplicate detection of select() vs. poll()-variant from proxy.cpp, signaler.cpp and zmq.cpp. This patch has not been tested on many build platforms: especially the cmake build needs testing / patching. For the other builds, hard code the result as these these are all Windows platforms.