[tlbuild] casefolding fallback search

[Hironobu Yamashita]

Hi,

2018-02-07 8:52 GMT+09:00 Norbert Preining <preining at logic.at>:
>> Any version of Mac OS X / macOS can have the hard drive formatted as
>> either case sensitive or case insensitive. Nothing changed with 10.13.
>
> Is there a syscall that determines sensitivity?
>

I don't think there is one

> It is not possible to check on each kpse call whether the fs is case
> sensitive by creating files and checking for case variants.

So I think skipping --no-casefold-search test cases on macOS is enough,
even when the new functionality is compiled into the binary.
It might help someone to document that --no-casefold-search
does not work on native case-insensitive fs.

Hironobu