test: fix Windows CI by rewriting symbols-leak-test from bash to python

The CI started installing some wrapper instead of a real bash which is
what gets found.

See:
actions/runner-images#1081

Given meson is written in python, it should always be available
hopefully.

Signed-off-by: Ran Benita <ran@unusedvar.com>

meson.build

@@ -478,7 +478,7 @@ test(
 )
 test(
     'symbols-leak-test',
-    find_program('test/symbols-leak-test.bash'),
+    find_program('test/symbols-leak-test.py'),
     env: test_env,
 )
 if get_option('enable-x11')

test/symbols-leak-test.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""Check that all exported symbols are specified in the symbol version scripts.
+
+If this fails, please update the appropriate .map file (adding new version
+nodes as needed).
+"""
+import glob
+import os
+import pathlib
+import re
+import sys
+
+
+top_srcdir = pathlib.Path(os.environ['top_srcdir'])
+
+
+def symbols_from_map(path):
+    return re.findall(r'^\s+(xkb_.*);', path.read_text(), re.MULTILINE)
+
+
+def symbols_from_src(path):
+    return re.findall(r'XKB_EXPORT.*\n(xkb_.*)\(', path.read_text())
+
+
+def diff(map_path, src_paths):
+    map_symbols = set(symbols_from_map(map_path))
+    src_symbols = set.union(set(), *(symbols_from_src(path) for path in src_paths))
+    return sorted(map_symbols - src_symbols), sorted(src_symbols - map_symbols)
+
+
+exit = 0
+
+# xkbcommon symbols
+left, right = diff(
+    top_srcdir/'xkbcommon.map',
+    [
+        *(top_srcdir/'src').glob('*.c'),
+        *(top_srcdir/'src'/'xkbcomp').glob('*.c'),
+        *(top_srcdir/'src'/'compose').glob('*.c'),
+    ],
+)
+if left:
+    print('xkbcommon map has extra symbols:', ' '.join(left))
+    exit = 1
+if right:
+    print('xkbcommon src has extra symbols:', ' '.join(right))
+    exit = 1
+
+# xkbcommon-x11 symbols
+left, right = diff(
+    top_srcdir/'xkbcommon-x11.map',
+    [
+        *(top_srcdir/'src'/'x11').glob('*.c'),
+    ],
+)
+if left:
+    print('xkbcommon-x11 map has extra symbols:', ' '.join(left))
+    exit = 1
+if right:
+    print('xkbcommon-x11 src has extra symbols:', ' '.join(right))
+    exit = 1
+
+sys.exit(exit)