meson: Implement duplicate includes check with clang-tidy

Instead of doing this with our own script, let's use clang-tidy
instead.

.clang-tidy

@@ -2,7 +2,8 @@
 ---
 Checks: '
     -*,
-    misc-header-include-cycle
+    misc-header-include-cycle,
+    readability-duplicate-include
 '
 WarningsAsErrors: '*'
 HeaderFileExtensions:

meson.build

@@ -2824,16 +2824,6 @@ if git.found()
                 run_target(
                         'ctags',
                         command : [env, 'ctags', '--tag-relative=never', '-o', '@0@/tags'.format(meson.project_source_root())] + all_files)
-
-                ############################################
-
-                if want_tests != 'false' and conf.get('BUILD_MODE_DEVELOPER') == 1
-                        test('check-includes',
-                             files('tools/check-includes.py'),
-                             args: all_files,
-                             env : ['PROJECT_SOURCE_ROOT=@0@'.format(meson.project_source_root())],
-                             suite : 'headers')
-                endif
         endif
 
         ####################################################

tools/check-includes.py

@@ -1,32 +0,0 @@
-#!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
-
-# pylint: disable=consider-using-with
-
-import os
-import pathlib
-import re
-import sys
-
-PROJECT_ROOT = pathlib.Path(os.getenv('PROJECT_SOURCE_ROOT', '.'))
-
-def check_file(filename):
-    seen = set()
-    good = True
-    for n, line in enumerate(open(filename)):
-        m = re.match(r'^\s*#\s*include\s*[<"](\S*)[>"]', line)
-        if m:
-            include = m.group(1)
-            if include in seen:
-                try:
-                    filename = pathlib.Path(filename).resolve().relative_to(PROJECT_ROOT)
-                except ValueError:
-                    pass
-                print(f'{filename}:{n}: {line.strip()}')
-                good = False
-            seen.add(include)
-    return good
-
-if __name__ == '__main__':
-    all_good = all(check_file(name) for name in sys.argv[1:])
-    sys.exit(0 if all_good else 1)