linkerror fixed on ubuntu

Author: tmori

examples/hello_world/CMakeLists.txt

@@ -27,4 +27,11 @@ target_link_libraries(
     hello_world
     assets
     conductor
-)
+)
+if(NOT WIN32)
+    find_package(Threads REQUIRED)
+    target_link_libraries(
+        hello_world
+        Threads::Threads
+    )
+endif()

examples/pdu_communication/CMakeLists.txt

@@ -44,3 +44,14 @@ target_link_libraries(
     asset_controller
     assets
 )
+if(NOT WIN32)
+    find_package(Threads REQUIRED)
+    target_link_libraries(
+        asset_plant
+        Threads::Threads
+    )
+    target_link_libraries(
+        asset_controller
+        Threads::Threads
+    )
+endif()