core188: Ship libusb

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/config/rootfiles/core/188/filelists/libusb b/config/rootfiles/core/188/filelists/libusb
new file mode 120000 (symlink)
index 0000000..edbe8c2
--- /dev/null
+++ b/config/rootfiles/core/188/filelists/libusb
@@ -0,0 +1 @@
+../../../common/libusb
\ No newline at end of file