add cppcheck package (#10)

Cppcheck 2.19.1 static analysis tool, built from source. Includes
the MISRA C addon, cfg files, and platform definitions for opendbc
and panda safety analysis.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

cppcheck/cppcheck/__init__.py

@@ -0,0 +1,16 @@
+import os
+import sys
+
+DIR = os.path.join(os.path.dirname(__file__), "install")
+
+
+def _run():
+  binary = os.path.join(DIR, "cppcheck")
+  os.execvp(binary, ["cppcheck"] + sys.argv[1:])
+
+
+def smoketest():
+  import subprocess
+  binary = os.path.join(DIR, "cppcheck")
+  result = subprocess.run([binary, "--version"], capture_output=True, text=True, check=True)
+  print(result.stdout.strip())