[issue37330] open(): remove 'U' mode, deprecated since Python 3.3

[Andrew Bartlett]

Andrew Bartlett <abartlet at samba.org> added the comment:

This breaks Samba's build:

https://bugzilla.samba.org/show_bug.cgi?id=14266

While we are of course able to patch new versions of Samba, this will make it harder to bisect back though Samba history.  It would be really great if this kind of change could be reverted or at least deferred so Samba can rely on a stable language platform for it's build system.

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nosy: +abartlet

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