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[libunwind] Emit dependent libraries only when detected by CMake
996e62e added Linux-specific dependent libraries to libunwind sources. As a result, building libunwind with modern LLD on *BSD started failing due to trying to link libdl. Instead, add those libraries only if they were detected by CMake. While technically we could create a long list of systems that need -ldl and -lpthread, maintaining a duplicate list makes little sense when CMake needs to detect it for non-LLD systems anyway. Remove existing system exceptions since they should be covered by the CMake check anyway. Remove -D_LIBUNWIND_HAS_COMMENT_LIB_PRAGMA since it is no longer explicitly needed, if we make the library-specific defines dependent on presence of this pragma support. Differential Revision: https://reviews.llvm.org/D70868
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