build: Add epoll-shim library directory - #225
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epoll-shimis discovered through pkg-config when nativeepoll_wait()is unavailable. The existing CMake configuration propagates the package's include directories and library names, but not its library search directories.Add
${EPOLL_SHIM_LIBRARY_DIRS}totarget_link_directories()so the linker can locateepoll-shimwhen it is installed outside the default library search path.This is required for the Homebrew
epoll-shimpackage on macOS. Systems with nativeepoll_wait()leave the variable empty, and the existing epoll-shim detection and library selection are otherwise unchanged.Tested as part of a successful macOS arm64 build and end-to-end DATUM Gateway run with a local Bitcoin node and BitAxe miner.