add fake pll symlink

diff --git a/experiments9/freepdk_c4m45/pll.py b/experiments9/freepdk_c4m45/pll.py
new file mode 120000 (symlink)
index 0000000..fcf6e0a
--- /dev/null
+++ b/experiments9/freepdk_c4m45/pll.py
@@ -0,0 +1 @@
+../pll.py
\ No newline at end of file