[C2hs] darcs patch: add ptrto directive

[General Failure]

1 patch for repository http://code.haskell.org/c2hs:

Sun Mar 24 16:21:29 CET 2013  p.balzarek at googlemail.com
  * add ptrto directive

{#ptrto <path> #} creates a pointer into a c structure, following
<path>. It behaves much like get or set, but instead of marshalling the
target it returns a pointer to it.
This is useful e.g. when the associated Haskell type doesn't
have a Storable instance, for example SockAddr.
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