libiconv patch to build with llvm/clang c compiler

[Ryan Flynn]

Hello,

Attached is a patch that allows the libiconv port to build with the
llvm/clang C compiler.
It updates a few existing patches and adds 2 new ones, basically just
adding --tag=CC under libtool,
since apparently it is unable to discern that clang is a c compiler.
With this patch libiconv builds
(with a few minor warnings from clang related to the source) and
passes "make check".

A couple of people have been working to get FreeBSD compiling under clang:

    http://wiki.freebsd.org/BuildingFreeBSDWithClang

and from these results

    http://lists.cs.uiuc.edu/pipermail/cfe-dev/2009-June/005274.html

it appears that getting libiconv building with clang will be helpful
towards that effort.

Please let me know if this patch is usable, and if not what I can do.

Thanks

Ryan
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