[clang] Enforce UTF-8 in make_cxx_dr_status (#131816)

Otherwise Windows users have troubles with lexer tests that use emojis.

Author: Endilll

clang/www/make_cxx_dr_status

@@ -39,7 +39,7 @@ def collect_tests():
       continue
     test_cpp = os.path.join(dr_test_dir, test_cpp)
     found_any = False;
-    for match in re.finditer(status_re, open(test_cpp, 'r').read()):
+    for match in re.finditer(status_re, open(test_cpp, 'r', encoding="utf-8").read()):
       dr_number = int(match.group(1))
       if dr_number in status_map:
         print("error: Comment for cwg{} encountered more than once. Duplicate found in {}".format(dr_number, test_cpp))