Missing boost_optional property folder

Author: Jackarain

CMakeLists.txt

@@ -438,6 +438,7 @@ set_property(TARGET boost_system PROPERTY FOLDER "third_party/boost")
 set_property(TARGET boost_thread PROPERTY FOLDER "third_party/boost")
 set_property(TARGET boost_variant2 PROPERTY FOLDER "third_party/boost")
 set_property(TARGET boost_unordered PROPERTY FOLDER "third_party/boost")
+set_property(TARGET boost_optional PROPERTY FOLDER "third_party/boost")
 
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