Update .gitignore

diff --git a/.gitignore b/.gitignore
index 9ccca4b..86a1b5d 100644
--- a/.gitignore
+++ b/.gitignore

@@ -1,5 +1,8 @@
-precheck_results
-*.hex*
+*~
+*.swp
 *.lst
 *.vcd
 *.gtkw
+precheck_results
+mgmt_core_wrapper
+openlane/Makefile

diff --git a/openlane/Makefile b/openlane/Makefile
deleted file mode 120000
index 48e5b4a..0000000
--- a/openlane/Makefile
+++ /dev/null

@@ -1 +0,0 @@
-../caravel/openlane/Makefile
\ No newline at end of file