[Ocaml-lib-devel] ExtList: using _setcdr instead of Obj.magic

[Brian H. <bh...@sp...>]

Went through and changed all the inlined _setcdr calls to normal _setcdr 
calls.

a) If we never call the function, why define it?

b) function calls aren't that expensive.  And _setcdr is probably inlined 
in most cases anyways.

c) In the future, when we have to change the magic incantation to make it 
work, we only have to change it once, in _setcdr, and not all over.

Brian