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There are two solutions:
1) Move PyMac_getscript() to _localemodule.
2) Copy PyMac_getscript() to _localemodule.
3) #ifdef PyLocale_getdefaultlocale in _localemodule on something set by 
enable_toolbox_module_glue.

1) means we can't really put the external declaration in macglue.h any 
more (_localemodule needn't be configured), but I don't think it's used by 
anything but localemodule, so it's probably the best solution.

Still, this is an incompatible change, so we shouldn't backport it.