Remove std::shared_ptr to not depend on atomics

Author: chris-durand

include/memory

@@ -70,21 +70,12 @@
 #ifdef __cpp_rtti
   #include <typeinfo>         	  // std::type_info in get_deleter
 #endif
-#  include <ext/atomicity.h>
-#  include <ext/concurrence.h>
 #  include <bits/functexcept.h>
 #  include <bits/stl_function.h>  // std::less
 #  include <bits/uses_allocator.h>
 #  include <type_traits>
 #  include <debug/debug.h>
 #  include <bits/unique_ptr.h>
-#  include <bits/shared_ptr.h>
-#  include <bits/shared_ptr_atomic.h>
-#  if _GLIBCXX_USE_DEPRECATED
-#    include <backward/auto_ptr.h>
-#  endif
-#else
-#  include <backward/auto_ptr.h>
 #endif
 
 #if __cplusplus >= 201103L