bug#42702: catch2 build failure on ARM

[Danny Milosavljevic]

Hi Maxim,

On Mon, 03 Aug 2020 14:22:21 -0400
maxim.cournoyer@gmail.com wrote:

>      } else if ('\0' <= value && value < ' ') {
>                 ~~~~~^~~~~~~~

I think that this tries to find non-printable characters, so those with ASCII
codes 0 < value < 32 and 128 < value < 255.  But char is unsigned on ARM, so
it won't do that with the code above.  Therefore, this IS an error and treating
it as a warning would be very, very, bad.

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