Fix opencv (#910)

* let opencv depend on libjpeg-turbo

* fix libjpeg-turbo dependency

cmake/third_party.cmake

@@ -89,8 +89,6 @@ set(oneflow_third_party_dependencies
   grpc_copy_headers_to_destination
   grpc_copy_libs_to_destination
   cub_copy_headers_to_destination
-  libjpeg_copy_headers_to_destination
-  libjpeg_copy_libs_to_destination
   opencv_copy_headers_to_destination
   opencv_copy_libs_to_destination
   eigen

cmake/third_party/libjpeg-turbo.cmake

@@ -63,7 +63,8 @@ ExternalProject_Add(libjpeg-turbo
 
 # put libjpeg-turbo includes in the directory where they are expected
 add_custom_target(libjpeg_create_header_dir
-    COMMAND ${CMAKE_COMMAND} -E make_directory ${LIBJPEG_INCLUDE_DIR})
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${LIBJPEG_INCLUDE_DIR}
+    DEPENDS libjpeg-turbo)
 
 add_custom_target(libjpeg_copy_headers_to_destination
     DEPENDS libjpeg_create_header_dir)
@@ -76,7 +77,7 @@ endforeach()
 # pub libjpeg libs in the directory where they are expected
 add_custom_target(libjpeg_create_library_dir
     COMMAND ${CMAKE_COMMAND} -E make_directory ${LIBJPEG_LIBRARY_DIR}
-    DEPENDS zlib)
+    DEPENDS libjpeg-turbo)
 
 add_custom_target(libjpeg_copy_libs_to_destination
     COMMAND ${CMAKE_COMMAND} -E copy_if_different ${LIBJPEG_BUILD_STATIC_LIBRARIES} ${LIBJPEG_LIBRARY_DIR}

cmake/third_party/opencv.cmake

@@ -32,6 +32,7 @@ endforeach()
 if (BUILD_THIRD_PARTY)
 
 ExternalProject_Add(opencv
+    DEPENDS libjpeg_copy_headers_to_destination libjpeg_copy_libs_to_destination
     PREFIX opencv
     GIT_REPOSITORY ${OPENCV_URL}
     GIT_TAG ${OPENCV_TAG}