FindThreads: Restore hard-coded '-l' flag on library name
Revert !3857 (merged). Some clients depend on the value of CMAKE_THREAD_LIBS_INIT
to contain a valid flag.
Fixes: #20061 (closed), #20065 (closed)
Issue: #19747
Backport: release
Revert !3857 (merged). Some clients depend on the value of CMAKE_THREAD_LIBS_INIT
to contain a valid flag.
Fixes: #20061 (closed), #20065 (closed)
Issue: #19747
Backport: release