[arccore,concurrency] Add target 'Threads::Threads' to target 'arccore_concurrency'.

This is needed to make sure libraries needed for threads are linked.

Author: grospelliergilles

arccore/src/concurrency/arccore/concurrency/CMakeLists.txt

@@ -37,6 +37,11 @@ endif()
 
 target_link_libraries(arccore_concurrency PUBLIC arccore_base)
 
+find_package(Threads)
+if (TARGET Threads::Threads)
+  target_link_libraries(arccore_concurrency PRIVATE Threads::Threads)
+endif()
+
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