darcs patch: Fix detection of libiconf.

[Matthias Kilian]

Sat Jun 20 14:21:59 CEST 2009  Matthias Kilian <kili at outback.escape.de>
  * Fix detection of libiconf.
  It's not enough to try to link against libiconv and look for a
  symbol iconv_open, because iconv may be installed in a way that
  internally renames iconv_foo to libiconv_foo in the library and
  adds corresponding #define iconv_foo libiconv_foo to iconv.h.
  
  This patch is needed on OpenBSD (but it's not enough, since cabal
  suffers from the same problem).
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