Core Update 173: Ship libarchive

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>

diff --git a/config/rootfiles/core/173/filelists/libarchive b/config/rootfiles/core/173/filelists/libarchive
new file mode 120000 (symlink)
index 0000000..551f1f7
--- /dev/null
+++ b/config/rootfiles/core/173/filelists/libarchive
@@ -0,0 +1 @@
+../../../common/libarchive
\ No newline at end of file