Petr Hosek 69258491d2 [libc] Support configurable errno modes (#98287) ...

Rather than selecting the errno implementation based on the platform
which doesn't provide the necessary flexibility, make it configurable.

The errno value location is returned by `int *__llvm_libc_errno()` which
is a common design used by other C libraries.

2024-07-13 10:52:42 -07:00

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