versioner: add symlink for dependencies.

Add a symlink where dependencies used to live, so that `versioner`
works.

Test: versioner
Test: tools/versioner/run_tests.py
Change-Id: I86999bb79baad16039709306591cb9540fb533ca
diff --git a/tools/versioner/dependencies b/tools/versioner/dependencies
new file mode 120000
index 0000000..4ec3391
--- /dev/null
+++ b/tools/versioner/dependencies
@@ -0,0 +1 @@
+../../libc/versioner-dependencies
\ No newline at end of file