CI: skip external files for cppcheck

.github/workflows/cppcheck.yml

@@ -39,6 +39,7 @@ jobs:
         mkdir build
         cd build
         cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        python ../cppcheck/remove_external.py compile_commands.json
 
     - name: Run cppcheck
       run: |

cppcheck/remove_external.py

@@ -0,0 +1,15 @@
+import sys
+import json
+
+f = open(sys.argv[1])
+data = json.load(f)
+f.close()
+
+v = []
+for el in data:
+	if not ("/external/" in el['file']):
+		v.append(el)
+
+f = open(sys.argv[1], 'w')
+json.dump(v, f, indent=2)
+f.close()