[tlbuild] casefolding fallback search

[Hironobu Yamashita]

Hi Karl,

> And I committed some changes to kpathsea/pathsearch.c to partially
> implement a fallback casefolding search. It should only be compiled in
> on Unix; #ifdef-d out on Windows.

I think macOS (at least <= 10.12 Sierra) should also be disabled, as
it's file system HFS is case-insensitive. I don't know much about
10.13 High Sierra (which is said that new case-sensitive APFS is
available). My test failure (OS X 10.11.6 El Capitan) attached.

Best,
Hironobu

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