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When not using the `-pthread` flag we instead return a library to link by name. Previously we hard-coded the `-l` flag before the library name. When used with `target_link_libraries`, the hard-coded `-l` flag is preserved rather than transformed into the link option preferred by the toolchain in use. Drop the explicit `-l` part to let CMake's generators produce the proper way to link the threads library for the current toolchain. Fixes: #19747
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