rename archival/libunarchive -> archival/libarchive; move bz/ into it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/lzop.c b/archival/lzop.c
index acb34fe..094e78c 100644
--- a/archival/lzop.c
+++ b/archival/lzop.c
@@ -26,7 +26,7 @@
 */
 
 #include "libbb.h"
-#include "unarchive.h"
+#include "archive.h"
 #include "liblzo_interface.h"
 
 /* lzo-2.03/src/lzo_ptr.h */