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Fix the load_* using test Makefiles not to link -ldl on NetBSD. There is no such a library on NetBSD, and dlopen() is available without a library. Quoting the manpage: (These functions are not in a library. They are included in every dynamically linked program automatically.) To resolve this portably, introduce a new USE_LIBDL option. If it set to 1, Makefile.rules automatically appends -ldl on platforms needing it. Differential Revision: https://reviews.llvm.org/D58517 llvm-svn: 354617