lib/locale.t: Don't assume NUL is a control

A test that assumed NUL would be considered a control fails in locales
where it isn't considered a control.

This was found on FREEBSD, where the locale "hi_IN.ISCII-DEV" is
defective (based on the Wikipedia article on ISCII
https://en.wikipedia.org/wiki/Indian_Script_Code_for_Information_Interchange).
Only the code points 0x09-0x0D are considered controls in this
implementation, whereas the article says ISCII is a superset of ASCII,
so should have 33 controls, not just 5.  (Unrelated to this ticket, but
another apparent defect I saw is that this implementation defines 0x91,
but the article says that code point is unassigned.)

0 files changed, 0 insertions, 0 deletions