C library: add __to{lower,upper} as alternative names for {tolower,toupper} #8283
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macOS eventually calls a function called
__tolower
(__toupper
). Rename our previous implementation to__CPROVER_tolower
(__CPROVER_toupper
) and make bothtolower
(toupper
) and__tolower
(__toupper
) use this. Also enable their regression tests.