[PATCH] [libc++] Linux: Correctly identify valid error codes

[David Majnemer]

[syserr.errcat.objects]p4 specifies that
system_category().default_error_condition(ev) map to error_condition(posv,
generic_category()) if ev could map to a POSIX errno.

Linux reserves up to and including 4095 for errno values, use this as a
bound.

This fixes syserr.errcat.objects/system_category.pass.cpp on Linux.
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