Fix in-tree build for OBS cmake version 3.0.0

CMakeLists.txt

@@ -1,6 +1,9 @@
 # --- Detect if the plugin is build out of tree or not ---
 if(CMAKE_PROJECT_NAME STREQUAL "obs-studio")
   set(BUILD_OUT_OF_TREE OFF)
+  if(OBS_CMAKE_VERSION VERSION_GREATER_EQUAL 3.0.0)
+    legacy_check()
+  endif()
 else()
   set(BUILD_OUT_OF_TREE ON)
   cmake_minimum_required(VERSION 3.18)
@@ -104,9 +107,14 @@ if(BUILD_OUT_OF_TREE)
         LIBRARY DESTINATION ${CMAKE_INSTALL_PREFIX}/${LIB_OUT_DIR})
     install(DIRECTORY data/locale data/images
         DESTINATION ${CMAKE_INSTALL_PREFIX}/${DATA_OUT_DIR})
+    setup_plugin_target(${PROJECT_NAME})	
 else()
     target_include_directories(${PROJECT_NAME} PRIVATE
         "${CMAKE_SOURCE_DIR}/UI/obs-frontend-api")
-    set_target_properties(${PROJECT_NAME} PROPERTIES FOLDER "plugins/aitum")
+    if(OBS_CMAKE_VERSION VERSION_GREATER_EQUAL 3.0.0)
+        set_target_properties_obs(${PROJECT_NAME} PROPERTIES FOLDER "plugins/aitum" PREFIX "")
+    else()
+        set_target_properties(${PROJECT_NAME} PROPERTIES FOLDER "plugins/aitum")
+        setup_plugin_target(${PROJECT_NAME})
+    endif()
 endif()
-setup_plugin_target(${PROJECT_NAME})