Don't add_subdirectory on a binary directory

This doesn't make sense and didn't do anything.

Change-Id: If6cbcd9269d8d45b091f100318afd3ab9ec6ceec

rocclr/CMakeLists.txt

@@ -87,7 +87,7 @@ endif()
 
 set(COMGR_CPP device/comgrctx.cpp)
 
-add_subdirectory(elf/utils/libelf "${CMAKE_CURRENT_BINARY_DIR}/libelf" )
+add_subdirectory(elf/utils/libelf)
 
 set(oclruntime_src
   thread/thread.cpp