build: avoid using CMP for BZ2File

Some Python distributions do not support
context manager protocol (CMP) for BZ2File.

PR-URL: #31198
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Christian Clauss <cclauss@me.com>

configure.py

@@ -1540,8 +1540,11 @@ def write_config(data, name):
     os.mkdir(icu_tmp_path)
     icu_data_path = os.path.join(icu_tmp_path, icu_data_file_l)
     with open(icu_data_path, 'wb') as outf:
-        with bz2.BZ2File(compressed_data, 'rb') as inf:
-            shutil.copyfileobj(inf, outf)
+        inf = bz2.BZ2File(compressed_data, 'rb')
+        try:
+          shutil.copyfileobj(inf, outf)
+        finally:
+          inf.close()
     # Now, proceed..
 
   # relative to dep..