[PATCH] build: fix libarchive detection

[Stefan (metze) Metzmacher]

Hi Björn,

> our libarchive detection was solidly broken, we also don't rely on pkgconfig now.
> 
> Signed-off-by: Bjoern Jacke <bj at sernet.de>
> 
> BUG: https://bugzilla.samba.org/show_bug.cgi?id=11296

Reviewed-by: me

Please move the Signed-off-by and Reviewed-by lines to the end...

Thanks!
metze

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