Adding cling as llvm external project is done implicitly already when placing...

Adding cling as llvm external project is done implicitly already when placing cling (soft link) in llvm/src/tools

interpreter/llvm/src/tools/CMakeLists.txt

@@ -87,8 +87,4 @@ if( NOT LLVM_INCLUDE_TOOLS STREQUAL "bootstrap-only" )
   add_llvm_implicit_external_projects()
 endif()
 
-if( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/cling/CMakeLists.txt )
-  add_llvm_external_project( ${CMAKE_CURRENT_SOURCE_DIR}/cling )
-endif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/cling/CMakeLists.txt )
-
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)