git: Update to libarchive-2.8.4.

[Peter Avalos]

On Mon, Dec 20, 2010 at 11:33:28AM -0800, Matthew Dillon wrote:
> 
>     I think this broke our snapshot builds.  The pkgsrc bootstrap is no
>     longer working, something about missing lzma symbols/procedures.
> 
>     >  /usr/lib/libarchive.so: undefined reference to `lzma_lzma_preset'
>     >  /usr/lib/libarchive.so: undefined reference to `lzma_stream_decoder'
>     ...
> 
>     I don't see any lzma functions in the libarchive commit at all.
> 

Indeed...I forgot to link in liblzma.  Fixed in
823e0f3df3d577e42a19828ee19720ebab194099.

--Peter
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