Issue #11621: fix bootstrap issue with getopt/gettext (following d3e46930ffe9)

Lib/getopt.py

@@ -34,7 +34,11 @@ option involved with the exception.
 __all__ = ["GetoptError","error","getopt","gnu_getopt"]
 
 import os
-from gettext import gettext as _
+try:
+    from gettext import gettext as _
+except ImportError:
+    # Bootstrapping Python: gettext's dependencies not built yet
+    def _(s): return s
 
 class GetoptError(Exception):
     opt = ''