Rewrite check-includes.pl in python

tools/check-includes.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# pylint: disable=missing-docstring,invalid-name,unspecified-encoding,consider-using-with
+
+import re
+import sys
+
+def check_file(filename):
+    seen = set()
+    good = True
+    for n, line in enumerate(open(filename)):
+        if m := re.match(r'^\s*#\s*include\s*[<"](\S*)[>"]', line):
+            include = m.group(1)
+            if include in seen:
+                print(f'{filename}:{n}: {line.strip()}')
+                good = False
+            seen.add(include)
+    return good
+
+if __name__ == '__main__':
+    good = all(check_file(name) for name in sys.argv[1:])
+    sys.exit(0 if good else 1)