[Cleanup] Remove duplicate entries of CUB submodule (issue# 4395) (#4499)

* remove third_part/cub

* remove from third_party
Co-authored-by: Israt Nisa <nisisrat@amazon.com>
Co-authored-by: Xin Yao <xiny@nvidia.com>

.gitmodules

@@ -10,9 +10,6 @@
 [submodule "third_party/METIS"]
 	path = third_party/METIS
 	url = https://github.com/KarypisLab/METIS.git
-[submodule "third_party/cub"]
-	path = third_party/cub
-	url = https://github.com/NVIDIA/cub.git
 [submodule "third_party/phmap"]
 	path = third_party/phmap
 	url = https://github.com/greg7mdp/parallel-hashmap.git

CMakeLists.txt

@@ -51,7 +51,7 @@ if(USE_CUDA)
   include(cmake/modules/CUDA.cmake)
   message(STATUS "Use external CUB/Thrust library for a consistent API and performance.")
   cuda_include_directories(BEFORE "${CMAKE_SOURCE_DIR}/third_party/thrust")
-  cuda_include_directories(BEFORE "${CMAKE_SOURCE_DIR}/third_party/cub")
+  cuda_include_directories(BEFORE "${CMAKE_SOURCE_DIR}/third_party/thrust/dependencies/cub")
 endif(USE_CUDA)
 
 # initial variables

cub @ cdaa9558

-Subproject commit cdaa9558a85e45d849016e5fe7b6e4ee79113f95