rccl-UnitTests - link to dl library (#1673)

test/CMakeLists.txt

@@ -84,6 +84,7 @@ if(BUILD_TESTS)
   target_link_libraries(rccl-UnitTests PRIVATE ${GTEST_BOTH_LIBRARIES})
   target_link_libraries(rccl-UnitTests PRIVATE hip::host hip::device hsa-runtime64::hsa-runtime64)
   target_link_libraries(rccl-UnitTests PRIVATE Threads::Threads)
+  target_link_libraries(rccl-UnitTests PRIVATE dl)
   if(OPENMP_TESTS_ENABLED)
     target_link_libraries(rccl-UnitTests PRIVATE "${OpenMP_CXX_FLAGS}")
   endif()