Remove Threads dependency (#4501)

* Experiment with removing Threads

* Use private Threads

* Removed Threads

* Added Threads to benchmark

* Revert Threads

* Remove threads
Co-authored-by: Scott Cyphers <diyessi@users.noreply.github.com>

cmake/share/ngraphConfig.cmake.in

@@ -28,9 +28,6 @@
 
 @PACKAGE_INIT@
 
-include(CMakeFindDependencyMacro)
-find_dependency(Threads)
-
 if(NOT TARGET ngraph)
     include("${CMAKE_CURRENT_LIST_DIR}/ngraphTargets.cmake")
 endif()

src/ngraph/CMakeLists.txt

@@ -732,8 +732,7 @@ target_include_directories(ngraph PUBLIC $<BUILD_INTERFACE:${NGRAPH_INCLUDE_PATH
 add_library(ngraph::ngraph ALIAS ngraph)
 
 if (NOT WIN32)
-    find_package(Threads REQUIRED)
-    target_link_libraries(ngraph PUBLIC dl Threads::Threads)
+    target_link_libraries(ngraph PRIVATE dl)
 endif()
 
 if (NGRAPH_ONNX_IMPORT_ENABLE)

src/tools/nbench/CMakeLists.txt

@@ -26,7 +26,9 @@ add_executable(nbench ${SRC})
 if (APPLE)
     set_property(TARGET nbench APPEND_STRING PROPERTY LINK_FLAGS " -Wl,-rpath,@loader_path/../lib")
 endif()
-target_link_libraries(nbench PRIVATE ngraph)
+
+find_package(Threads REQUIRED)
+target_link_libraries(nbench PRIVATE ngraph Threads::Threads)
 if (NGRAPH_CPU_ENABLE)
     target_link_libraries(nbench PRIVATE cpu_backend)
 endif()