BSD 4_3 development

Work on file sys

Synthesized-from: CSRG/cd1/4.3

diff --git a/sys b/sys
new file mode 120000 (symlink)
index 0000000..35bf1a9
--- /dev/null
+++ b/sys
@@ -0,0 +1 @@
+usr/src/sys
\ No newline at end of file