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[lldb] [test] Do not link -ldl on NetBSD

Authored by mgorny on Feb 21 2019, 12:28 PM.

Description

[lldb] [test] Do not link -ldl on NetBSD

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

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