build: add cgo to nogo exceptions

Seems like cgo is placing some files in a separate directory in the
workspace root.

Change-Id: Icd94dec7281350339f0b1dd88d61556d75982d64
Reviewed-on: https://review.monogon.dev/c/monogon/+/1836
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/build/analysis/nogo_config.json b/build/analysis/nogo_config.json
index 21afc4d..06cb4c4 100644
--- a/build/analysis/nogo_config.json
+++ b/build/analysis/nogo_config.json
@@ -60,7 +60,8 @@
   },
   "commentwrap": {
     "exclude_files": {
-      "external/": "third_party"
+      "external/": "third_party",
+      "cgo/": "cgo"
     }
   },
   "noioutil": {